Table 2:
Standard air pollutant concentrations and indices.
API
500
400
300
200
100
50
Pollutant concentrations (mg/m
3
)
SO
2
2.62
2.100
1.60
0.80
0.15
0.05
0.94
0.750
0.565
0.15
0.10
0.05
NO
2
0.94
0.750
0.565
0.28
0.12
0.08
TSP
1.00
0.875
0.625
0.50
0.30
0.12
PM
10
0.60
0.500
0.420
0.35
0.15
0.05