India, Nov. 4 -- Delhi's air quality remained in the "very poor" category for a fourth straight day on Tuesday, even as wind speed was expected to drop due to a western disturbance, and worsen the situation. The 24-hour rolling average air quality index (AQI) of 311 (very poor) at 9am was marginally higher than the Monday 4pm reading of 309 (very poor) when the Central Pollution Control Board (CPCB) releases its daily national bulletin.

Meteorological experts said wind speed will drop sharply on Tuesday and remain almost calm on Wednesday due to a western disturbance. The Early Warning System (EWS) for Delhi has forecast the AQI will remain "very poor" on both days. EWS, which comes under the Ministry of Earth Sciences and is managed by ...