NYC-WTC_000187695

NYC 9/11 Public Portal Document

draft do not cite or quote 9/18/0J 9:49 AM

APPENDICES - Applicable Standards

National Ambient Air Quality Standards^ POLLUTANT STANDARD STANDARD VALUE * TYPE

Carbon Monoxide (CO) 8-hour Average .. 9,.ppm (10 rng/mj Primary Ihour Average 213 (40 mg/n?) Primary

Nitrogen Dioxide (NO2) Annual Arithmetic Mean 0.053 ppmj (100 pg/n?)|Primary & Secondary

Ozone (O3) 1-hour Average 0.12 ppm (235 pg/m^) Primary & Secondary 8-hour Average ** 0.08 ppm (157 pg/m^) Primary & Secondary

Lead (Pb) Quarterly Average 1.5 pg/m^j jPrimaiy & Secondary

Particulate (PM 10) Particles with diameters of 10 micrometers or less Annual Aritlunetic Mean 50 pg/m^ 'rimary & Seconda^ 24-hour Average 150 pg/m^ 'rimary & Secondary

Particulate (PM 2.5) Particles with diameters off. 5 micrometers or less Annual Aritlunetic Mean ** 15 pg/m’ Primary & Secondary' 24-hour Average ** 65 pg/n? Primary & Secondary

Sulfur Dioxide (SO2) Annual Aritlunetic Mean 0.03 ppm (80 pg/m) Primary 24-hour Average 0.14 ppm (365 p^m5 Primary 3-hour Average 0.50 ppm (1300 pg/m^ Secondary

Parenthetical value is an approximately equivalent concentration. ** The ozone 8-hour standard and the PM 2.5 standards are included for information only. A 1999 federal court ruling blocked implementation of these standards, which EPA proposed in 1997. EPA Iras asked tire U.S. Supreme Court to reconsider that decision. The Updated Air Quality Standards website has additional infonnation.

' Source US EPA. http;//www.epa.gov/airs/criteria.html

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NYC-WTC_000187695