New Delhi, Nov 4 (PTI) Delhi witnessed a slight improvement in air quality on Tuesday, slipping into the "poor" category with an overall Air Quality Index (AQI) of 291, mainly due to improved wind conditions, according to the Central Pollution Control Board (CPCB).

On Monday, the AQI was recorded in the "very poor" category with a reading of 309.

Westerly winds with speeds of up to 15 kilometre per hour prevailed over the city in the past 24 hours, aiding the dispersal of pollutants, the India Meteorological Department (IMD) said in its daily report.

Since Diwali, the city's AQI has been hovering in between "poor" and "very poor" categories, while slipping to "severe" on some days.

Air quality at 18 monitoring stations remained in the "very poor" category, with readings above 300. Alip

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