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    ASTM D3824 - 20

    Standard Test Methods for Continuous Measurement of Oxides of Nitrogen in the Ambient or Workplace Atmosphere by Chemiluminescence

    Active Standard ASTM D3824 | Developed by Subcommittee: D22.03

    Book of Standards Volume: 11.07

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    Significance and Use

    5.1 Most oxides of nitrogen are formed during high-temperature combustion. The U.S. Environmental Protection Agency (EPA) has set primary and secondary air quality standards for NO2 that are designed to protect the public health and the public welfare (40 CFR, Part 50).

    5.2 Oxides of nitrogen are generated by many industrial processes that can result in employee exposures. These are regulated by the Occupational Safety and Health Administration (OSHA), which has promulgated exposure limits for the industrial working environment (29 CFR, Part 1910).

    5.3 These test methods have been found to be satisfactory for measuring oxides of nitrogen in ambient and workplace atmospheres over the ranges shown in 1.1.

    1. Scope

    1.1 These test methods cover procedures for the continuous determination of total nitrogen dioxide (NO2) and nitric oxide (NO) as NOx, or nitric oxide (NO) alone or nitrogen dioxide (NO2) alone, in the ranges shown in the following table:


    Approximate Range of Concentration
    (25°C and 101.3 kPa (1 atm))





    Ambient Atmosphere

    Workplace Atmosphere


    μg/m3 (ppm)

    mg/m3 (ppm)





    10 to 600 (0.01 to 0.5)

    0.6 to 30 (0.5 to 25)

    (NO + NO2) = NOx

    20 to 1000 (0.01 to 0.05)

    1 to 50 (0.5 to 25) 


    20 to 1000 (0.01 to 0.5)

    1 to 50 (0.5 to 25) 

    1.2 The test methods are based on the chemiluminescent reaction between nitric oxide and ozone.

    1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see Section 9.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    Other Documents

    29 CFR Part 1910, Occupational Safety and Health Standards Available from U.S. Government Printing Office, Superintendent of Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://www.access.gpo.gov.

    ASTM Standards

    D1356 Terminology Relating to Sampling and Analysis of Atmospheres

    D1357 Practice for Planning the Sampling of the Ambient Atmosphere

    D1914 Practice for Conversion Units and Factors Relating to Sampling and Analysis of Atmospheres

    D3195/D3195M Practice for Rotameter Calibration

    D3249 Practice for General Ambient Air Analyzer Procedures

    D3609 Practice for Calibration Techniques Using Permeation Tubes

    D3631 Test Methods for Measuring Surface Atmospheric Pressure

    ICS Code

    ICS Number Code 13.040.30 (Workplace atmospheres)

    UNSPSC Code

    UNSPSC Code 77121501(Air quality management)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D3824-20

    Citation Format

    ASTM D3824-20, Standard Test Methods for Continuous Measurement of Oxides of Nitrogen in the Ambient or Workplace Atmosphere by Chemiluminescence, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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