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###### Environmental Protection Agency

          - [FRL-9422-01-ORD]

# AGENCY:

Environmental Protection Agency (EPA).

# ACTION:

Notice of the designation of a new reference method for monitoring ambient air quality.

# SUMMARY:

                        Notice is hereby given that the Environmental Protection Agency (EPA) has designated one new reference method for measuring concentrations of nitrogen dioxide (NO2) in ambient air.                    

# FOR FURTHER INFORMATION CONTACT:

                        Robert Vanderpool, Air Methods and Characterization Division (MD-D205-03), Center for Environmental Measurements and Modeling, U.S. EPA, Research Triangle Park, North Carolina 27711. Phone: 919-541-7877. Email:                         *Vanderpool.Robert@epa.gov.*

# SUPPLEMENTARY INFORMATION:

                    In accordance with regulations at 40 CFR part 53, the EPA evaluates various methods for monitoring the concentrations of those ambient air pollutants for which EPA has established National Ambient Air Quality Standards (NAAQS) as set forth in 40 CFR part 50. Monitoring methods that are determined to meet specific requirements for adequacy are designated by the EPA as either reference or equivalent methods (as applicable), thereby permitting their use under 40 CFR part 58 by States and other agencies for determining compliance with the NAAQS. A list of all reference or equivalent methods that have been previously designated by EPA may be found at                     *http://www.epa.gov/​ttn/​amtic/​criteria.html.*

                    The EPA hereby announces the designation of one new reference method for measuring concentrations of NO2                     in ambient air. This designation is made under the provisions of 40 CFR part 53, as amended on October 26, 2015(80 FR 65291-65468).                

                    The new reference method for NO2                     is an automated method (analyzer) utilizing the measurement principle based on gas phase chemiluminescence. This newly designated reference method is identified as follows:                

                    RFNA-1221-259, “KENTEK Inc. Model MEZUS 210 NO2                     Analyzer,” Chemiluminescence analyzer operated in a range of 0-0.5 ppm, with 0.45 µm, 47 mm diameter Teflon® filter installed, operated at temperatures between 20 °C and 30 °C, with nominal sampling flow rate of 800 cc/min, using a 5 minute averaging time, with either 105VAC-125VAC or 200VAC-240VAC input power options installed, 360-watt power consumption, equipped with 7 inch LCD touch screen display, and operated according to the KENTEK Inc. Model MEZUS 210 Nitrogen Oxide Analyzer Instruction Manual.                

                    This application for a reference method determination for this NO2                     method was received by the Office of Research and Development on October 25, 2021. This analyzer is commercially                           ( print page 7173)                        available from the applicant, KENTEK Inc., Hanshin S Meca room #526, 65 Techno 3-ro, Yuseong-gu, Daejeon, Republic of Korea, 34016.                

A representative test analyzer was tested in accordance with the applicable test procedures specified in 40 CFR part 53, as amended on October 26, 2015. After reviewing the results of those tests and other information submitted by the applicant, EPA has determined, in accordance with part 53, that this method should be designated as a reference method.

                    As a designated reference method, this method is acceptable for use by states and other air monitoring agencies under the requirements of 40 CFR part 58, Ambient Air Quality Surveillance. For such purposes, this method must be used in strict accordance with the operation or instruction manual associated with the method and subject to any specifications and limitations (                    *e.g.,*                     configuration or operational settings) specified in the designated method description (see the identification of the method above).                

                    Use of the method also should be in general accordance with the guidance and recommendations of applicable sections of the “Quality Assurance Handbook for Air Pollution Measurement Systems, Volume I,” EPA/600/R-94/038a and “Quality Assurance Handbook for Air Pollution Measurement Systems, Volume II, Ambient Air Quality Monitoring Program,” EPA-454/B-13-003, (both available at                     *http://www.epa.gov/​ttn/​amtic/​qalist.html*). Provisions concerning modification of such methods by users are specified under Section 2.8 (Modifications of Methods by Users) of Appendix C to 40 CFR part 58.                

Consistent or repeated noncompliance with any of these conditions should be reported to: Director, Air Methods and Characterization Division (MD-D205-03), Center for Environmental Measurements and Modeling, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711.

Designation of this reference method is intended to assist the States in establishing and operating their air quality surveillance systems under 40 CFR part 58. Questions concerning the commercial availability or technical aspects of the method should be directed to the applicant.

Alice Gilliland,

Acting Director, Center for Environmental Measurements and Modeling.

[FR Doc. 2022-02569 Filed 2-7-22; 8:45 am]

BILLING CODE 6560-50-P