Dust Storm in Delhi, Here's everything you should know. Delhi and adjoining areas have remained engulfed in a thick blanket of dust. The air quality in the national capital remained on the 'severe' and 'hazardous' level in many areas because of a ground-level dust storm in western India. Strong-anti cyclonic winds, blowing from Rajasthan, are the reason behind the worsening air quality. The current conditions are likely to last till Friday.