13 out of 20 world’s most polluted cities are from India; Byrnihat, Delhi top list

Air pollution in Delhi worsened, with the annual average PM2.5 concentration rising from 102.4 micrograms per cubic meter in 2023 to 108.3 micrograms...

By Sri Lakshmi Muttevi  Published on 11 March 2025 4:36 PM IST