The mercury in the national capital shot up to 35.8 degrees Celsius, the highest so far this season, on Monday.
The India Meteorological Department (IMD) said the city recorded a minimum of 18.5 degrees Celsius, a notch below the normal.
The air quality deteriorated slightly, moving to the middle of the moderate category (AQI 142) due to slow wind speed.
Mahesh Palawat of Skymet Weather, a private forecaster, said high humidity due to a fresh Western Disturbance is also responsible for deterioration of air quality, which had been oscillating in the good and satisfactory categories due to the 21-day lockdown imposed to contain coronavirus spread.
Cities across India have witnessed a reduction in local sources of pollution -- vehicular emissions, construction dust, stack emissions etc -- due to the 21-day lockdown.
Palawat said light rains are expected in Delhi on Tuesday evening and the mercury is likely to touch the 40 degrees Celsius-mark between April 15 and 20.
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