Assessment of Population Exposure to Coarse and Fine Particulate Matter in the Urban Areas of Chennai, India

Table 4

PM₁₀ vulnerability classes.

Class	PM10 pollution range (µg/m^3)	Population ratio (%)	Area ratio (%)
1	>150	28	25
2	100–150	68	61
3	75–100	4	12
4	<75	<1	2