NO2 24 hr < 25 ppm 168 hr < 3.6 ppm
NOx 24 hr 2 < 5 ppm 168 hr < 3.6 ppm
SO2 24 hr < 25 ppm 168 hr < 3.6 ppm
03 24 hr < 0.8 ppm 168 hr < 0.11 ppm
NH3 24 hr < 25 ppm  168 hr < 3.6 ppm

 

 Please note that all the above ranges depend on the sensitivity of the analyzing instruments.