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40 C.F.R. § 50.7

National primary and secondary ambient air quality standards for PM2.5.

§ 50.7 National primary and secondary ambient air quality standards for PM2.5.

(a) The national primary and secondary ambient air quality standards for particulate matter are 15.0 micrograms per cubic meter (µg/m ) annual arithmetic mean concentration, and 65 µg/m 24-hour average concentration measured in the ambient air as PM2.5 (particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers) by either:

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