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...Ecfr code of federal regulations about gpo newsroom media congressional relations inspector general careers contact askgpo help home customers vendors libraries fdsys s digital system electronic search government publications browse view past updates to the e cfr navigation aids click here learn more previous data is current as september simple title chapter i subchapter c part appendix advanced boolean next proximity protection environment history national primary and secondary ambient air quality standards tips corrections latest l reference method for determination fine particulate matter pm in atmosphere user info applicability faqs this provides measurement mass concentration having an agency list aerodynamic diameter less than or equal a nominal micrometers over hour period incorporation by purposes determining whether specified are met process considered be nondestructive sample obtained can subjected subsequent physical chemical analyses assessment related resources procedures ...