A Parameterized Method for Air-Quality Diagnosis and Its Applications

Table 2

Standard air pollutant concentrations and indices.

API		500	400	300	200	100	50
Pollutant concentrations (mg/m^3)	SO2	2.62	2.100	1.60	0.80	0.15	0.05
	NO𝑥	0.94	0.750	0.565	0.15	0.10	0.05
	NO2	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
	PM10	0.60	0.500	0.420	0.35	0.15	0.05