Table 2: Standard air pollutant concentrations and indices.

API50040030020010050

Pollutant concentrations (mg/m3)SO22.622.1001.600.800.150.05
0.940.7500.5650.150.100.05
NO20.940.7500.5650.280.120.08
TSP1.000.8750.6250.500.300.12
PM100.600.5000.4200.350.150.05