KOLKATA: Hundreds of citizens concerned about the environment took to the streets on Sunday to raise awareness on the alarming rise of air pollution in Kolkata.

As the impact of rain subsided, Delhi's air quality deteriorated further and slipped into the 'very poor' category on Thursday, authorities said.

Ahmedabad has been dealing with a serious issue of poor air quality for the last few months.

According to Central Pollution Control Board data, the city saw an air quality index value of 212 as opposed to 98 on Tuesday.

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On Monday, air quality at Bandra Kurla Complex (BKC), Mumbai's planned commercial hub, was far worse than several places in Delhi, raising concerns over the health of thousands of people who visit

Delhi air remained foul on Sunday too as the air quality index touched 414, a marginal improvement from Saturday’s 423, both in the ‘severe’ range.