India, Oct. 24 -- Delhi's air quality improved on Friday morning from "very poor" to "poor" category after four consecutive days, with a slight increase in wind speed, even as the minimum temperature dropped to 17degC, compared to 18.1degC a day earlier. On Thursday, the mercury went up to 32.2degC. Both the maximum and minimum temperatures were expected to stay in the same range.

An air quality index (AQI) of 290 (poor) was recorded at 9am, compared to a 24-hour average AQI of 305 (very poor) at 4pm on Thursday.

The Central Pollution Control Board data at 9am on Friday showed that out of Delhi's 38 active air quality stations, Anand Vihar (402) was in the "severe" range. The rest were in "very poor" or "poor" zones.

The Centre's Early...