C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 50—NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS

40 C.F.R. § 50.6

National primary and secondary ambient air quality standards for PM10

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(a) The level of the national primary and secondary 24-hour ambient air quality standards for particulate matter is 150 micrograms per cubic meter (µg/m 3), 24-hour average concentration. The standards are attained when the expected number of days per calendar year with a 24-hour average concentration above 150 µg/m 3, as determined in accordance with appendix K to this part, is equal to or less than one.

(b) [Reserved]

(c) For the purpose of determining attainment of the primary and secondary standards, particulate matter shall be measured in the ambient air as PM10 (particles with an aerodynamic diameter less than or equal to a nominal 10 micrometers) by:

(1) A reference method based on appendix J and designated in accordance with part 53 of this chapter, or

(2) An equivalent method designated in accordance with part 53 of this chapter.

[52 FR 24663, July 1, 1987, as amended at 62 FR 38711, July 18, 1997; 65 FR 80779, Dec. 22, 2000; 71 FR 61224, Oct. 17, 2006]
Notes of Decisions
Cited in 39 cases (4 in the last 5 years), 1973–2026 · leading case: Bahr v. U.S. Environmental Protection Agency
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Bahr v. U.S. Environmental Protection Agency (2016) ca9 · cites it 2× “40 C.F.R. § 50.6 (a). This standard, which is sometimes referred to as the “24-hour PM-10 standard,” is “attained when the expected number of days per calendar year with a 24-hour average concentration above 150 ìg/m³ .”
California Unions for Reliable Energy v. Mojave Desert Air Quality Management District (2009) calctapp · cites it 2× “( 40 C.F.R. § 50.6 (c) (2009).) PM10 can be further subclassified into fine particles, which are 2.”
Latino Issues Forum v. United States Environmental Protection Agency (2009) ca9 · cites it 2× “40 C.F.R. § 50.6 (c). On November 15, 1990, the date of enactment of the Clean Air Act Amendments of 1990, Congress designated ten PM-10 nonattainment areas, including the San Joaquin Valley, across the country.”
Sierra Club, Imperial County Air Pollution Control District, Intervenor v. United States Environmental Protection Agency (2003) ca9 “40 C.F.R. §§ 50.6 (a) and (b). The States are responsible for ensuring compliance with both standards for PM-10 and must formulate a state implementation plan (“SIP”) for doing so.”
Edward M. Ober Robin D. Silver v. United States Environmental Protection Agency (1996) ca9 · cites it 2× “See 40 C.F.R. § 50.6 (1994). 1 To ensure compliance with the NAAQS, each state must submit to the EPA an implementation plan that meets certain substantive requirements.”
Morton v. Missouri Air Conservation Commission (1997) moctapp · cites it 3× “010 (1988); see also National Ambient Air Quality Standards (NAAQS), promulgated by the United States Environmental Protection Agency (EPA), 40 C.F.R. § 50.6 (a) and (b) (1987). Pursuant to § 643.”
Edward M. Ober Robin d.silver David Matusow Sandra L. Bahr v. Christine Todd Whitman United States Environmental Protect (2001) ca9 “3d at 306 ; 40 C.F.R. § 50.6 . Each state must submit to EPA a state implementation plan to comply with the NAAQS; if EPA disapproves the state plan, EPA formulates a federal implementation plan for the area.”
Nucor Steel-Arkansas v. Pruitt (2017) dcd · cites it 2× “See 40 C.F.R. §§ 50.6 (setting NAAQS for PM10), 50.”
Matter of Canarico Quarries, Inc. (1979) prd “40 CFR 50.6 and 50.7. Puerto Rico adopted its State Implementation Plan for the attainment of the national standards for particulate matter and sulfur dioxide, the two pollutants considered to exceed the national standards within the air quality region of the Commonwealth.”
Ukeiley v. U.S. Envtl. Prot. Agency (2018) ca10 “See 40 C.F.R. 50.6 and 40 C.F.R. part 50, appendix K.”
State of Arizona v. Lee M. Thomas, Administrator, U.S. Environmental Protection Agency (1987) ca9 “40 C.F.R. § 50.6 (ambient air quality standard for particulate matter); 40 C.”
United States v. SCM Corp. (1985) mdd “See 40 C.F.R. §§ 50.6 , and 50.7. Following the promulgation of those standards, Maryland adopted and the EPA approved a Maryland SIP which is published in the Code of Maryland Regulations (COMAR) and in the Code of Federal Regulations.”
Show all 39 citing cases →
— 40 C.F.R. § 50.6(a) — 1 case
Morton v. Missouri Air Conservation Commission (1997) moctapp “010 (1988); see also National Ambient Air Quality Standards (NAAQS), promulgated by the United States Environmental Protection Agency (EPA), 40 C.F.R. § 50.6 (a) and (b) (1987). Pursuant to § 643.”
— 40 C.F.R. § 50.6(a)(b) — 1 case
Morton v. Missouri Air Conservation Commission (1997) moctapp “010 (1988); see also National Ambient Air Quality Standards (NAAQS), promulgated by the United States Environmental Protection Agency (EPA), 40 C.F.R. § 50.6 (a) and (b) (1987). Pursuant to § 643.”
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