As this map reveals, 91 per cent of all countries ... Meanwhile, India was home to six of the nine most polluted cities. The town of Byrnihat in northeastern India came in as the world's most ...

The annual average PM2.5 concentration in Byrnihat was 128.2 micrograms per cubic m (µg/m3), many times the World Health Organization’s annual air quality guideline of 5 µg/m3.

Notably, the most polluted city was neither Delhi, Mumbai, nor Pune. Meghalaya’s Byrnihat took the crown as the most polluted city. The The World Air Quality Report 2024 ranked Byrnihat ...