Ambient Air Quality Standards for the United States and Mexico | |||||
MEXICO | U.S. | ||||
Pollutant | Units | Average | Units | Average | |
O3 | 0.11 ppm | 1 hour | 0.12 ppm | 1 hour | |
SO2 | 0.13 ppm | 24 hours | 0.14 ppm | 24 hours | |
0.03 ppm | annual | 0.03 ppm | annual | ||
NO2 | 0.21 ppm | 1 hour | 0.25 ppm | 1 hour | |
0.053 ppm | annual | ||||
CO | 11 ppm | 8 hours | 9 ppm | 8 hours | |
35 ppm | |||||
1 hour | |||||
TSP | 260 ug/m3 | 24 hours | N/A | N/A | |
75 ug/m3 | annual | ||||
PM-10 | 150 ug/m3 | 24 hours | 150 ug/m3 | 24 hours | |
50 ug/m3 | annual | 50 ug/m3 | annual | ||
LEAD | 1.5 ug/m3 | 3 months | 1.5 ug/m3 | 3 months |