With slow moving winds and dense fog and low temperatures, the air quality in Delhi has slipped to 'severe' category on Friday. As per record, the overall air quality index (AQI) in Delhi was 432 on Friday, considerably high from Thursday's 362 (very poor).

A slight improvement has been registered in the air quality of Delhi's as it shifted from severe to very poor on Friday. The overall air quality index (AQI) was 364 at 9.30 am.

Air pollution level in Delhi has dropped to 'hazardous' level on Sunday with an overall Air Quality Index (AQI) of 625 - the highest this year - at around 10 am.

German Chancellor Angela Merkel is in Delhi when the national capital is passing through one of its worst phases of air pollution; taking a note of the situation, she said the air pollution can be a good argument on replacing the public buses which run on diesel with the electric ones.

A public health emergency has been declared in Delhi and nearby areas by the pollution control body appointed by the Supreme Court, as the air quality dropped to 'emergency' or 'severe-plus' category for the first time since January, on Friday.

Despite a complete ban on stubble burning in Punjab, several farmers were seen burning their crop residue in the Amritsar region, saying they cannot find any other alternative to it.

The air quality of Delhi and regions around it remained toxic between "severe" and "very-poor" levels even five days after Diwali, with weather conditions expected to be unfavourable till at least November 15.

Delhi and the National Capital Region (NCR) on Sunday witnessed 'very poor' air quality with the minimum temperature recorded at 12.4 degrees Celsius, two notches below the season's average, the Met office said.

Despite the Supreme Courts directives, people in Delhi-NCR on Wednesday continued to burst crackers on Diwali well past the 10 p.m. deadline though the air quality index (AQI) showed a slight improvement over last year.

Back is the season when Delhi's air quality turns hazardous for its residents, making it worse is the Diwali festival when people burst thousands of firecrackers only to decline fresh air quantity.