New Delhi:The national capital's air quality was recorded in the "poor" category on Sunday, with a central government agency reporting 1,230 farm fires in neighbouring states the maximum in a day so far this season.
The share of stubble burning in Delhi's PM2.5 pollution stood at 17 per cent. It was 19 per cent on Saturday, 18 per cent on Friday, around one per cent on Wednesday and around 3 per cent on Tuesday, Monday and Sunday.
The city recorded a 24-hour average air quality index (AQI) of 254. It was 287 on Saturday, 239 on Friday and 315 on Thursday, the worst since February 12 (AQI 320).
An AQI between 0 and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.
During the daytime, winds are blowing from the northwest, bringing pollutants from farm fires. At night, calm winds and low temperatures are allowing the accumulation of pollutants, according to an India Meteorological Department official.
Meanwhile, Union Environment Minister Prakash Javadekar on Sunday said the pollution problem cannot be resolved in a day and continuous efforts are needed to tackle each of the contributing factors.
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Interacting with people during a Facebook Live event, he said the major factors behind air pollution in the country are traffic, industries, waste, dust, stubble, geography and meteorology.
Dust is the major factor behind air pollution in north India, the minister said.
The soil type in north India is alluvial. Therefore, there's a lot of dust, which is the major reason behind air pollution in the region, he said.