Table 2-1. National Air Quality Standards 



Pol lutant 



Averag ing 

 Time 



Pr Imary 

 S tandard'i 



Secondary^ 

 Standards 



Reference 



Methods 



Sulfur Dioxide 



Annual 

 Arithmetic Mean 



2't hours 



3 hours 



80 ug/m3 

 (0.03ppni) 



365 ug/m' 

 (0. 1*4ppm) 



1300 ug/m^ 

 (0.5 PP"!) 



Pararosani 1 ine 



Method 



Particulate Annual Geometric 75 ug/m^ 

 Matter Mean 



2'( hours 



260 ug/m' 



,e 



60 ug/m-' 



150 ug/m^ 



High 

 Volune 

 Samp I Ing 

 Method 



Carbon 

 Monox ide 



8 hours 



1 hour 



IO"^/m^ 

 (9ppm) 



'tOmg/m^ 

 (35ppm) 



Same as 

 Primary 

 Standards 



Non-Oispers i ve 

 Infrared 

 Spectroscopy 



Ozone 



(corrected for 

 NO7 E SO^) 



I hour 



235 ug/m 

 (0.120 ppm) 



Same as 

 Primary 

 Standard 



Gas Phase 

 Chemi lumi- 

 nescent 

 Method 



Hydrocarbons 

 (corrected for 

 Methane) 



3 hours 



160 ug/mJ 

 (0.2'tppra) 



Same as 

 Pr imary 

 Standard 



Flame Ionization 

 Detection Using 

 Gas Chromatography 



N 1 t rogen 

 D iox i de 



Annual 

 Arithmetic Mean 



100 ug/m^ 

 (0.05 ppm) 



Same as 

 Pr imary 

 Standard 



Gas Pnase 

 Che^i luni nesence 



National standards other than those based on annual arithmetic means or annual geometric 

 means are not to be exceeded more than once per year. 



National Primary Standards: The levels of air quality necessary, with an adequate margin 

 of safety, to protect the public health. 



National Secondary Standards: The levels of air quality necessary to protect the public 

 welfare from any known or anticipated adverse effects of a pollutant. 



Reference method as described by the EPA. An "equivalent method" means any method of 

 sampling and analysis which can be demonstrated to the EPA to have » "consistent relationship 

 to the reference method". 



Guideline to be used assessing Implementation plans. 



3-C-2 



