As a thick blanket of haze and dust enveloped Delhi and parts of the National Capital Region (NCR), the air quality nosedived to the "severe" level.
The Environment Ministry has attributed the dusty conditions to an upshot of dust storms from Rajasthan.
The pollution masks are back and people have been advised to stay at home as the dusty conditions are likely to prevail for the next few days.
The pollution in Delhi has been worse than the last smog episode in November last year.
However, the current increase in levels of pollution is mainly due to drastic increase in coarse particles in air which has caused a spike in PM10 level but PM2.5 is not as high as that of last year.