India, Oct. 13 -- Delhi's air quality slipped back into the moderate category on Tuesday, a day after rainfall brought the city's air quality index (AQI) down to the satisfactory range.

The city recorded an AQI of 83 on Monday, a significant improvement from 111 on Sunday, following early-morning showers that also brought temperatures down. However, the improvement proved short-lived, as air quality deteriorated again on Tuesday, with an AQI of 138 recorded at 9.05 am.

The India Meteorological Department's weather observations showed on Tuesday that the maximum temperature at Safdarjung, Delhi's base weather station, was 30.2 degrees Celsius on Monday, four degrees Celsius below normal. The minimum temperature was 21.2 degrees Celsius, ...