India, Feb. 11 -- Delhi's air quality deteriorated marginally but remained at the higher end of the "poor" category for a second day on Tuesday even as the mercury was expected to go up to 29degC. The minimum temperature of 9.8degC on Tuesday was normal for this time of the year. It was 9.7degC a day earlier.

Delhi recorded its warmest day of the year on Monday with a maximum temperature of 28degC or five notches above normal. Sunny days were expected to continue.

The Central Pollution Control Board (CPCB) said an average Air Quality Index (AQI) of 285 (poor) was recorded at 9am on Tuesday compared to 271 (poor) at 4pm a day earlier, 227 (poor) on Sunday and 152 (moderate) on Saturday.

A western disturbance has slowed wind speed trappi...