Most polluted city per region

Countries with more than two million inhabitants; Data available only

for some cities and countries. *MEAN ANNUAL CONCENTRATION (μg/m³)

OF FINE SUSPENDED PARTICLES LESS THAN 2.5 MICRONS (PM2.5) IN DIAMETER. EPA PM2.5

STANDARDS FOR THE AIR QUALITY INDEX ARE SHOWN FOR COMPARISON.

NGM staff. Sources: World health organization; world bank