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

Table 5

PM_2.5 vulnerability classes.

Class	PM2.5 pollution range (µg/m^3)	Population (%)	Area ratio (%)
1	>75	94	89
2	75–50	5	10
3	50–37.5	1	1
4	<37.5	0	—