Acoustical Society of America Noise Standards

Acoustical Society of America Noise Standards

The Acoustical Society of America (ASA)’s noise standards include the S12 series, which is a multi-standard series that primarily focuses on the measurement of sound level in an environment and from different sources. A popular standard listed here is ASA/ANSI S12.2, the Criteria for Evaluating Room Noise, which covers the measurement of room noise using noise criteria curves and a method for evaluating low-frequency fluctuating noise using room noise criterion (RNC) curves.

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ANSI/ASA S12.10-2010/Part 1 (R2020)

Acoustics - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment - Part 1: Determination of Sound Power Level and Emission Sound Pressure Level

This American National Standard specifies procedures for measuring and reporting the noise emission of information technology and telecommunications equipment.

ANSI/ASA S12.10-2011/Part 2 (R2020)

American National Standard Acoustics - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment - Part 2: Declaration of Noise Emission Levels

This Standard applies to information technology and telecommunications equipment.

ASA/ANSI S12.11-2013/Part 1/ISO 10302-1:2011 (R2023)

Acoustics - Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices - Part 1: Airborne noise measurement

Specifies methods for measuring the airborne noise emitted by small air moving devices (AMDs), such as those used for cooling electronic, electrical, and mechanical equipment where the sound power level of the AMD is of interest. Examples of these AMDs include propeller fans, tube axial fans, vane axial fans, centrifugal fans, motorized impellers, and their variations. This part of this American National Standard describes the test apparatus and methods for determining the airborne noise emitted by small AMDs as a function of the volume flow rate and the fan static pressure developed by the AMD on the test apparatus. It is intended for use by AMD manufacturers, by manufacturers who use AMDs for cooling electronic equipment and similar applications, and by testing laboratories. It provides a method for AMD manufacturers, equipment manufacturers and testing laboratories to obtain comparable results. Results of measurements made in accordance with this part of this American National Standard are expected to be used for engineering information and performance verification, and the methods can be cited in purchase specifications and contracts between buyers and sellers. The ultimate purpose of the measurements is to provide data to assist the designers of electronic, electrical or mechanical equipment which contains one or more AMDs. Based on experimental data, a method is given for calculating the maximum volume flow rate of the scaled plenum up to which this part of this American National Standard is applicable.  

ASA/ANSI S12.11-2013/Part 2/ISO 10302-2:2011 (R2023)

Acoustics - Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices - Part 2: Structure-borne vibration measurements

Covers vibration levels from small air-moving devices (AMDs) with mounting footprints of less than 0.48 m × 0.90 m for the full-size test plenum defined in ANSI/ASA S12.11/Part 1 / ISO 10302-1 and less than 0.18 m × 0.3 m for the half-size plenum. It covers all types of AMDs which can be mounted on, and are self-supported at, the discharge or inlet plane of a test plenum box as specified in ANSI/ASA S12.11-2013/Part 1 / ISO 10302-1:2011. The procedures defined in this part of this American National Standard specify methods for determining the vibration levels that a small AMD would induce in an average structure used in information technology and telecommunications equipment. The methods specified in this part of this American National Standard allow the determination of induced vibration levels for the individual AMD that is tested. These data can be used to determine the statistical values of vibration levels for a production series if levels are measured for several units of that series. 

ASA/ANSI S12.1-1983 (R2023)

Guidelines for the Preparation of Standard Procedures to Determine the Noise Emission from Sources

This Standard contains guidelines for the preparation of procedures (standards, test codes, recommended practices, etc.) for determination of noise emission from sources. Included are the general questions that need to be considered during development of a measurement procedure. Guidelines on the following subjects are included: prefatory material, measurement conditions, measurement operations, data reduction, preparation of a test report, and guidelines for the selection of a descriptor for noise emission.

ASA/ANSI S12.12-1992 (R2024)

Engineering Method for the Determination of Sound Power Levels of Noise Sources Using Sound Intensity

This standard describes a method for in situ determination of the sound power level of noise sources in indoor or outdoor environments using sound intensity measurements. The standard contains information on instrumentation, installation and operation of the source, procedures for the selection of a measurement surface, methods of the sampling of sound intensity on the measurement surface, procedures for the calculation of sound power level, and techniques that can be used to qualify the measurement environment.

ASA S12.13 TR-2002 (R2025)

Technical Report Evaluating the Effectiveness of Hearing Conservation Programs through Audiometric Data Base Analysis

This ASA Technical Report describes methods for evaluating the effectiveness of hearing conservation programs in preventing occupational noise-induced hearing loss by using techniques for audiometric data base analysis. The rationale is given for using the variability of threshold measurements in annual monitoring audiograms as the basis for judging effectiveness. Guidelines are discussed concerning how to select a restricted data base to which the analysis procedures will be applied. Specific procedures for data analysis are defined, and criterion ranges are given for classifying program effectiveness as acceptable, marginal, or unacceptable. Sample results for industrial audiometric data bases contributed to Working Group S12/WG12 are included as an annex for reference and illustration.

ASA/ANSI S12.14-2024

Methods for the Field Measurement of the Sound Output of Audible Public Warning Devices Installed at Fixed Locations Outdoors

This American National Standard describes relatively simple procedures for measuring and reporting certain properties of sounds produced by audible public warning devices. Methods are given for the measurement of the C-weighted sound level and for determining the one-third octave band containing the fundamental frequency of tonal warning sounds produced by audible public warning devices at a distance of 30.5 m (100 ft) from the device and at the mounted height of the device. A method is also given for measuring the maximum level of the sound from a warning sound source at the heads of bystanders on the ground. These methods may be used by manufacturers to specify, in part, the sound produced by their products, by customers to verify compliance with pertinent sound output specifications, and by warning system designers to estimate warning sound coverage.

ASA/ANSI S12.15-1992 (R2024)

For Acoustics - Portable Electric Power Tools, Stationary and Fixed Electric Power Tools, and Gardening Appliances - Measurement of Sound Emitted

This standard describes a method for in situ determination of the sound power level of noise sources in indoor or outdoor environments using sound intensity measurements. The standard contains information on instrumentation, installation and operation of the source, procedures for the selection of a measurement surface, methods of the sampling of sound intensity on the measurement surface, procedures for the calculation of sound power level, and techniques that can be used to qualify the measurement environment.

ASA/ANSI S12.17-1996 (R2024)

Impulse Sound Propagation for Environmental Noise Assessment

This standard describes engineering methods to calculate the propagation of high-energy impulsive sounds through the atmosphere for purposes of assessment of environmental noise. The methods yield estimates for the mean C-weighted sound exposure level of impulsive sound at distances between the source and receiver ranging from 1 to 30 km. Equations to estimate the standard deviation about the mean C-weighted sound exposure levels are provided. The methods apply for explosive masses between 50 g and 1000 kg.

ASA/ANSI S12.18-1994 (R2023)

Procedures for Outdoor Measurement of Sound Pressure Level

This American National Standard describes procedures for the measurement of sound pressure levels in the outdoor environment, considering the effects of the ground, the effects of refraction due to wind and temperature gradients, and the effects due to turbulence. This standard is focused on measurement of sound pressure levels produced by specific sources outdoors. The measured sound pressure levels can be used to calculate sound pressure levels at other distances from the source or to extrapolate to other environmental conditions or to assess compliance with regulation This standard describes two methods to measure sound pressure levels outdoors. METHOD No. 1: general method, outlines conditions for routine measurements. METHOD No. 2: precision method, describes strict conditions for more accurate measurements. This standard assumes the measurement of A-weighted sound pressure level or time-averaged sound pressure level octave, 1/3-octave or narrow-band sound pressure level, but does not preclude determination of other sound descriptors.

ASA/ANSI S12.19-1996 (R2025)

Measurement of Occupational Noise Exposure

The standard presents methods that can be used to measure a person’s noise exposure received in a work place. The methods have been developed to provide uniform procedures and repeatable results for the measurement of occupational noise exposure.

ASA/ANSI S12.2-2019 (R2023)

Criteria for Evaluating Room Noise

This Standard provides three primary methods for evaluating room noise: a survey method that employs the A-weighted sound level; an engineering method that employs expanded noise criteria (NC) curves; and a method for evaluating low-frequency fluctuating noise using room noise criterion (RNC) curves.

ASA/ANSI S12.23-1989 (R2025)

Method for the Designation of Sound Power Emitted by Machinery and Equipment

This standard describes methods for determining and verifying labeled values for the noise emitted by machinery and equipment. Two types of labeling are considered in this standard: machines labeled with individual values and machines labeled with the same value for the batch. For economical reasons, the labeled value for all machines of a batch of machines may be checked by sampling procedures. This standard does not deal with the consequences to be drawn if the labeled value is not verified for the batch of machines or for the single machine. Purpose: The principal purposes of this standard are to prescribe methods for verifying labeled noise emission values and to provide information to the labeler on the determination of noise emission values for product noise labeling purposes.

ASA/ANSI S12.3-2023

Declaration of Product Noise Emission Values

Information on the acoustical noise emitted by machinery, equipment, and products is needed by consumers, manufacturers, building and land-use planners, governmental authorities, and others concerned about noise in order to make informed purchasing decisions. To meet this need, this standard gives requirements and guidelines for how to properly and uniformly provide product noise level information to the public. This standard specifies the noise emission values to be declared for a batch of machines, equipment, or products and the requirements for their presentation; the method for determining the mean A-weighted sound power level; and the method for optionally determining the standard deviation. This standard is applicable to commercially available products that emit noise, including consumer products and household appliances, information technology products, industrial equipment, outdoor equipment and construction machinery, and other products.

ASA/ANSI S12.42-2010 (R2024)

Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures

This standard specifies microphone-in-real-ear (MIRE) methods for the measurement of the insertion loss of active and passive circumaural earmuffs, helmets, and communications headsets, and specifies acoustic test fixture (ATF) methods for the measurement of the insertion loss of active and passive earplugs, earmuffs, helmets, and communications headsets. The MIRE methods are appropriate for use with continuous noise whereas the ATF methods may be used with both continuous noise and high-level impulsive noise test signals. The standard contains information on instrumentation, calibration, and electroacoustic requirements, procedures for determining sound pressure levels in the ear with and without the hearing protection devices in place, and procedures for calculating the corresponding insertion loss values. The standard also describes how to combine the active contribution of insertion loss for active devices measured using the MIRE method with the passive real-ear attenuation measured in accordance with ANSI/ASA S12.6 to obtain an attenuation value for use in estimating sound pressure levels for active protectors in accordance with ANSI/ASA S12.68. Requirements for reporting of the data are also described.

ASA/ANSI S12.43-1997 (R2025)

Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Position

This Standard provides three methods to measure sound pressure levels from all types of machinery and equipment at workstations and other specified positions. The first method applies to measurements in an essentially free field over a reflecting plane. These sound pressure levels are, in general, equal to or lower than those that would occur when the machine is operated in its normal surroundings as the effects of background noise or reflections from surfaces other than the mounting surface are excluded. The second method applies to measurements in normal operating environments where the effects of background noise and reflections from surfaces surrounding the machine are accounted for in the measurements. The third method is a survey method of measurement for sound sources operating in their normal environments when less-accurate measurements are acceptable.

ASA/ANSI S12.44-1997 (R2025)

Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and Other Specified Positions from Sound Power Level

This Standard provides a method for determining emission sound pressure levels from the sound power level produced by all types of machinery and equipment at workstations and other specified locations. These sound pressure levels are, in general, less than those that would be measured when the machinery or equipment is operating in its normal surroundings where the environment may influence the measurement of an emission sound pressure level.

ANSI/ASA S12.50-2002/ISO 3740-2000 (R2020)

Acoustics – Determination of sound power levels of noise sources – Guidelines for the use of basic standards

This Nationally Adopted International Standard gives guidance for the use of a series of nine International Standards describing various methods for determining the sound power levels from all types of machinery and equipment.

It provides:
- brief summaries of these basic International Standards;
- guidance on the selection of one or more of these standards which are appropriate to any particular type (see clause 6 and annex D). The guidance given applies only to airborne sound. It is for use in the preparation of noise test codes (see ISO 12001) and also in noise testing where no specific noise test code exists.

This Nationally Adopted International Standard is not intended to replace any of the details of, or add any additional requirements to, the individual test methods in the other basic standards referred to.

ASA/ANSI S12.51-2012/ISO 3741:2010 (R2025)

Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms (a nationally adopted international standard)

This American National Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured in a reverberation test room. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third-octave, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditionsat the time and place of the test and those corresponding to a reference characteristic impedance. Measurement and calculation procedures are given for both a direct method and a comparison method of determining the sound power level and the sound energy level.

ANSI/ASA S12.53-1999/Part 2 /ISO 3743-2-1994 (R2020)

Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms

Specifies a relatively simple engineering method for determining the sound power levels of small, movable noise sources.

ASA/ANSI S12.54-2011/ISO 3744:2010 (R2025)

Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane (a nationally adopted international standard)

This American National Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands or with A-weighting applied, is calculated using those measurements.

ASA/ANSI S12.55-2012/ISO 3745:2012 (R2023)

Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms (Includes Amendment)

This American National Standard specifies methods for measuring the sound pressure levels on a measurement surface enveloping a noise source (machinery or equipment) in an anechoic room or a hemi-anechoic room. The sound power level (or, in the case of impulsive or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third octave or with frequency weighting A applied, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic acoustic impedance.

ASA/ANSI S12.56-2011/ISO 3746:2010 (R2025)

Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (a nationally adopted international standard)

This American National Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source with frequency A-weighting applied is calculated using those measurements.

ASA/ANSI S12.60/Part 1-2010 (R2024)

Performance Criteria, Design Requirements, and Guidelines for Schools - Part 1: Permanent Schools

This document is Part 1 of the ANSI/ASA S12.60 series and is applicable to classrooms and other learning spaces in permanent schools. Part 2 of the ANSI/ASA S12.60 series is applicable to relocatable classrooms and relocatable modular core learning spaces. This standard includes acoustical performance criteria, and design requirements for classrooms and other learning spaces. Annex A provides procedures for optional testing to determine conformance with the source background noise requirements and the noise isolation requirements of this standard. Annex B provides commentary information on various paragraphs of this standard. Annex C provides guidelines for controlling reverberation in classrooms.

ASA/ANSI S12.60-2009/Part 2 (R2024)

Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools - Part 2: Relocatable Classroom Factors

This document is Part 2 of the ANSI/ASA S12.60 series. This part is applicable to relocatable classrooms and other relocatable modular core learning spaces of small to moderate size. This standard includes siting requirements, acoustical performance criteria, and design requirements for relocatable classrooms. Annex A (informative) provides commentary information on this standard, and Annex B (normative) provides procedures for determining compliance with the background sound requirements. This standard seeks to provide design flexibility without compromising the goal of obtaining adequate speech intelligibility for all students and teachers in classrooms and learning spaces within the scope of this standard.

ASA/ANSI S12.60-2019/Part 4 (R2024)

Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools, Part 4: Acoustic Standards for Physical Education Teaching Environments

This document is applicable to gymnasia and other physical education learning spaces in permanent schools. This standard includes acoustical performance criteria and design requirements for gymnasia and other physical education learning spaces. Annex A provides procedures for optional testing to determine conformance with the source background noise requirements and the reverberation time requirements of this standard. Annex B provides commentary information on various paragraphs of this standard. Annex C provides guidelines for controlling reverberation in gymnasia and other physical education spaces. Annex D provides guidelines for controlling background noise in gymnasia and other physical education spaces.

ASA/ANSI S12.61-2024

Declaration and Verification of Noise Emission Values of Machinery, Equipment, and Products

Information on the acoustical noise emitted by machinery, equipment, and products is needed by consumers, manufacturers, building and land-use planners, governmental authorities, and others concerned about noise in order to make informed purchasing decisions. To meet this need, this standard gives requirements and guidelines for how to properly and uniformly provide product noise level information to the public. This standard specifies the noise emission values to be declared (required and optional) for a batch of machines, equipment, or products and the requirements for their presentation It describes the method for determining the mean A-weighted sound power level; the method for determining the standard deviation of production; the method for determining the total standard deviation; the method for determining the mean A-weighted emission sound pressure level; the method for determining the expanded uncertainty; and the method for verifying the noise emission values that are declared by manufacturers and other product suppliers. This standard is applicable to commercially available products that emit noise, including consumer products and household appliances, information technology products, industrial equipment, outdoor equipment and construction machinery, and other products.

ASA/ANSI S12.6-2016 (R2025)

Methods for Measuring the Real-Ear Attenuation of Hearing Protectors

This standard specifies laboratory-based procedures for measuring, analyzing, and reporting the passive noise-reducing capabilities of hearing protectors. The procedures consist of psychophysical tests conducted on human subjects to determine the real-ear attenuation measured at hearing threshold. Two fitting procedures are provided: Method A) trained-subject fit, intended to describe the capabilities of the devices fitted by carefully trained users, and Method B) inexperienced-subject fit, utilizes subjects with little or no experience with respect to the use of hearing protection, in order to approximate the attenuation that can be attained by groups of users as reported in real-world occupational studies. Regardless of test method, the attenuation data will be valid only to the extent that the users wear the devices in the same manner as during the tests. This standard does not address issues pertaining to computational schemes or rating systems for applying hearing protector attenuation values (see ANSI/ ASA S12.68), nor does it specify minimum performance values for hearing protectors, or addresscomfort or wearability features. Method A of this standard corresponds to ISO 4869-1:1990, Acoustics –Hearing protectors – Part 1: Subjective method for the measurement of sound attenuation, and Method B corresponds to ISO/TS 4869-5:2006, Acoustics – Hearing protectors – Part 5: Method for estimation of noise reduction using fitting by inexperienced test subjects.

ASA/ANSI S12.71-2018 (R2022)

Performance Criteria for Systems that Estimate the Attenuation of Passive Hearing Protectors for Individual Users

This standard pertains to systems intended to estimate the attenuation of hearing protection devices (HPDs) obtained by individual wearers in actual practice. Such systems are designated field attenuation estimation systems (FAESs). This standard provides a classification of FAESs and specifies performance criteria. It also details the evaluation methodology and statistical calculations to be performed on such systems in order to state the uncertainty associated with the individual attenuation estimates that they provide, and specifies a method for computing a personal attenuation rating (PAR). FAES-derived data do not replace the attenuation values from ANSI/ASA S12.6 or the insertion-loss data from ANSI/ASA S12.42, nor are such data suitable for labeling the attenuation of HPDs.

ASA/ANSI S12.7-1986 (R2024)

Methods for Measurements of Impulse Noise

This standard describes methods for measurement of impulse noise and presentation of data. Its scope applies to all kinds of impulse noise, whether discrete event sources, such as quarry and mining explosions or sonic booms, or from multiple event sources such as pile drivers, riveting, or machine-gun firing, but not to sounds from other sources which have specific measurement standards based on the general methods for measurement of quasi steady noise. Data which may be reported include characteristics of the time variation of the sound pressure, with or without specific frequency weighting, and sound exposure level.

ASA/ANSI S12.72-2015 (R2025)

Procedure for Measuring the Ambient Noise Level in a Room

This standard specifies requirements and describes procedures for the measurement of ambient noise in a room. The measurements may be made at a specified point in the room, in a defined region of the room, or the measurements may be made to represent the space-average sound pressure level throughout the room. Two methods are offered: a survey method for quick evaluation and an engineering method for a more precise assessment of the ambient noise level. Both fixed and moving measurement microphones are allowed. The scope of this standard includes all types of ambient noise including building utility systems and exterior noise intrusion from street traffic and aircraft. Noise sources excluded from the scope of this standard include noise from building occupants and transient noise sources. The results of the measurements obtained via this standard are intended to be used to compare measured sound pressure levels with acoustic criteria similar to those presented in ANSI/ASA S12.2. It should be noted that by its very nature, ambient noise is not always stationary in time. Consequently, one should not expect to obtain identical results when a procedure specified in this standard is used in the same room at a different time.

ASA/ANSI S12.75-2012 (R2025)

Methods for the Measurement of Noise Emissions from High Performance Military Jet Aircraft

This standard describes noise measurement procedures to characterize the noise emissions from high performance (supersonic jet flow) military aircraft. Specific detailed noise measurement procedures are described for characterizing noise for environmental documents such as environmental impact statements and environmental assessments, and for quantifying aircraft noise emissions. This standard describes test procedures for ground run-up and flyover tests for conventional take-off and landing, short/vertical take-off and landing operations. The standard also describes signal processing, data formatting, and measurement uncertainty.

ASA/ANSI S12.76-2017 (R2025)

Methods for Measurement of Supersonic Jet Noise from Uninstalled Military Aircraft Engines

This standard describes procedures to measure jet noise from uninstalled military aircraft engines with supersonic exhaust flows. The methods pertain to propulsion systems mounted on outdoor test stands with appropriate inlets and representative nozzles. Detailed measurement procedures are described for near-field acoustical characterization. These data can be used to establish baseline noise levels, assess effectiveness of noise reduction technologies, estimate personnel noise exposure, and provide full-scale data for refinement of engine noise models. Far-field measurement procedures are described to provide data for estimates of community noise. This standard describes required measurement instrumentation, signal processing, data formatting, and measurement uncertainty. This standard does not apply to commercial engines, dual-use engines, or other engines covered by FAA/ICAO noise certification requirements.

ANSI/ASA S12.79-2021/ISO 26101-21

Acoustics - Test methods for the qualification of free-field environments

This document describes the divergence loss method of measurement of performance of an environment designed to provide a free sound field or free sound field over a reflecting plane. An acoustical environment is a free sound field if it has bounding surfaces that absorb all sound energies incident upon them. This is normally achieved using specialized test environments, such as anechoic or hemi-anechoic chambers. In practice, these provide a controlled free sound field for acoustical measurements in a confined space within the facility.

ASA/ANSI S12.8-1998 (R2024)

Methods for Determination of Insertion Loss of Outdoor Noise Barriers

This Standard presents three methods for determining the insertion loss of outdoor noise barriers. The methods are ‘‘direct’’ BEFORE and AFTER measurements; ‘‘indirect’’ BEFORE measurements at an ‘‘equivalent’’ site; and ‘‘indirect’’ predictions of BEFORE sound levels. ‘‘Indirect BEFORE measurements’’ and ‘‘indirect BEFORE prediction’’ methods require direct measurements of AFTER sound levels. Measurements of acoustical descriptors use sound sources naturally present at a site, controlled natural sound sources, or controlled artificial sound sources. Within prescribed limits, the receiver location and atmospheric, ground, and terrain conditions may be chosen based on the objectives for determination of barrier insertion loss. Examples are provided for worksheets that may be used for data acquisition and analysis.

ANSI/ASA S12.9-1992/Part 2 (R2023)

Quantities and Procedures for Description and Measurement of Environmental Sound, Part 2: Measurement of Long-Term, Wide-Area Sound

This standard is the second in a proposed series of parts concerning description and measurement of outdoor environmental sound. This standard describes recommended procedures for measurement of long-term, time-average environmental sound outdoors at one or more locations in a community for environmental assesment of planning for compatible land uses and for other purposes such as noise predication validation and regulation. Sound may be produced by one or more separate, distributed sound sources such as highway, factory, or airport, or by all contributing sound sources. For spatial or temporal samples of environmental sound in a community, requirememts are given for the number of sound-measurement locations and the duration of the sound-sampling intervals needed to obtain average values for long-term environmental sound levels that are withing stated accuracy limits for Class A, Class B, or Class C measurements. The purpose of this standard is to provide for a commonality for measurements of outdoor environmental sound as it may affect people in and around dwellings.

ASA/ANSI S12.9-2013/Part 1 (R2023)

Quantities and Procedures for Description and Measurement of Environmental Sound, Part 1: Basic Quantities and Definitions

This standard provides basic quantities for description of sound in community environments and general procedures for measurement of these quantities. Based on these quantities and procedures, compliance limits of sound may be specified by cognizant authorities and conformance with the limits controlled for purposes of environmental assessment, regulation, and land use planning.

ASA/ANSI S12.9-2013/Part 3 (R2023)

Quantities and Procedures for Description and Measurement of Environmental Sound - Part 3: Short-term Measurements with an Observer Present

This standard is the third in a series of parts concerning description and measurement of outdoor environmental sound. The standard describes recommended procedures for measurement of short-term, time-average environmental sound outdoors at one or more locations in a community for environmental assessment or planning for compatible land uses and for other purposes such as demonstrating compliance with a regulation. These measurements are distinguished by the requirement to have an observer present. Sound may be produced by one or more separate, distributed sources of sound such as a highway, factory, or airport. Methods are given to correct the measured levels for the influence of background sound.

ASA TR S12.9-2018/Part 6

Rationale for Withdrawing ANSI/ASA S12.9-2008/Part 6 (a technical report prepared by ANSI-Accredited Standards Committee S12 and registered with ANSI)

This ASA Technical Report provides the rationale for the recommendation by Working Group S12/WG 15 to withdraw the 2008 ANSI/ASA Standard “Quantities and Procedures for Description and Measurement of Environmental Sound — Part 6: Methods for Estimation of Awakenings Associated with Outdoor Noise Events Heard in Homes.” The decision to withdraw the standard is based in part on the relatively small and non-representative corpus of field observations of noise-induced behavioral awakening available for analysis; on the poor generalizability of predicted awakening rates from airport to airport; on practical experience with the limited utility of predictions of “at least one behavioral awakening per night” for purposes of assessing environmental noise impacts, as required by the National Environmental Policy Act; on the statistical assumptions of convenience and post hoc analysis methods used to generate predictions of awakenings; on information published subsequent to development of the original standard; and on the findings of peer-reviewed re-analyses of the findings on which the original standard was based.

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