India, Feb. 22 -- Delhi on Saturday recorded its fourth consecutive day of "moderate" air quality. The 24-hour average air quality index (AQI) of Delhi was 155 (moderate) at 4pm, according to the Central Pollution Control Board's (CPCB) daily national buletin, a steady improvement from Wednesday's 180 AQI (moderate), which had improved to 160 on Thursday and 158 on Friday.

Before this a three-day streak of moderate air quality was recorded from February 13-15 .

CPCB classifies AQI between 0 and 50 as "good", 51 and 100 as "satisfactory", 101 and 200 as "moderate", 201 and 300 as "poor", 301 and 400 as "very poor", and more than 400 as "severe".

Forecasts by the Air Quality Early Warning System (AQEWS) for Delhi suggest that AQI will st...