Ambient PM2.5 exposure climatology in India and vulnerability assessment
Ambient PM2.5 concentration has been estimated from MISR AOD for the period 2000-2015 at daily scale. Exposure has been assessed by overlaying population distribution from Indian Census. Annual PM2.5 exposure is estimated by averaging daily exposure, which is then re-gridded to district level in a statistical software using the district shape files. Figure 1a depicts the mean annual PM2.5 concentration at district level over India. PM2.5 concentration in the districts in Indo-Gangetic Belt exceeds the Indian standard by more than 2 times. Mean annual ambient PM2.5 exposure exceeds Indian standard in 50% districts. The corresponding numbers for WHO-IT1, WHO-IT2, WHO-IT3 and WHO-AQG are 72%, 82%, 97% and 99%. Based on PM2.5 concentration, the districts are classified into 7 vulnerability classes. Vulnerability classes are defined as ‘very low’ (<5th percentile), ‘low’ (5th-10th percentile), ‘moderate’ (10th-25th percentile), ‘high’ (25th-50th percentile), ‘very high’ (50th-75th percentile), ‘severe’ (75th-90th percentile) and ‘extreme’ (>90th percentile) based on 15-year PM2.5 statistics. The districts in the Indo-Gangetic Belt are classified in the ‘very high’, ‘severe’ and ‘extreme’ vulnerability class.
These Figures are Published in Chowdhury & Dey et al., 2016
Figure 1. (a) Mean annual ambient PM2.5 exposure (in µg/m3) and (b) vulnerability assessment at district level over India for the period 2001-2015. Vulnerability classes are defined as 'very low' (<5th percentile), 'low' (5th-10th percentile), 'moderate' (10th-25th percentile), ‘high’ (25th-50th percentile), 'very high' (50th-75th percentile), 'severe' (75th-90th percentile) and 'extreme' (>90th percentile) based on 15-year statistics.