Unfavourable weather conditions coupled with extra pollutants from firecrackers in Delhi-NCR led to "severe-plus" or "emergency" air quality on Friday, and the toxicity isn't going to improve for at least 2 more days.

With maximum fire counts from stubble burning in neighbouring states -- 2,100, which is four times higher than last year, on Thursday, Delhi and areas around it on Friday were found more polluted than Thursday, a day after Diwali.