Which are India’s 10 most and 10 least polluted cities today?

Ballabgarh was India's most polluted city on Friday, recording an Air Quality Index (AQI) of 400, according to CPCB data. Delhi (373), Ghaziabad (368), Khora (355) and Greater Noida (348) followed. Srinagar recorded the lowest AQI at 17, followed by Aizawl (19), Gangtok (22), Shillong (40) and Chamarajanagar (45). All 10 most polluted cities recorded 'Very Poor' air quality.