Experts have warned that the air quality in the city will further deteriorate in the coming days.
Haryana and western Uttar Pradesh burn crop remains to clear their fields for the next sowing cycle.
Northwest winds coming from these states will also pick up speed gradually, carrying smoke from stubble burning into Delhi, according to air quality forecast agency SAFAR.
India's pollution problem, however, is not just limited to Delhi and Indian cities routinely dominate global pollution rankings.
Last week, India's financial capital Mumbai witnessed a drop in air quality, overtaking Delhi several times this month. Officials said that withdrawing rains and constructions work caused the rise in pollution levels in the city.
The madness age. We had ample evidence, and chose to let some people poison the only livable atmosphere we know of in the entire universe, not for the greater good or to feed everyone, no, they did it so some people could be fantastically rich. A planet of billions, ruined by the greed of a few, for a better profit margin.
But its air turns especially toxic in winter due to various factors, including burning of crop remains by farmers, low wind speeds and bursting of firecrackers during festivals.
Environment Minister Gopal Rai said that the second phase of a Graded Response Action Plan (GRAP) has been implemented to combat the effect of increased pollution.
The burning of crop stubble, which is also a major source of pollution, hasn't picked up speed yet in the regions near Delhi but it is expected to intensify in the coming days.
Farmers in neighbouring states of Punjab, Haryana and western Uttar Pradesh burn crop remains to clear their fields for the next sowing cycle.
Northwest winds coming from these states will also pick up speed gradually, carrying smoke from stubble burning into Delhi, according to air quality forecast agency SAFAR.
Last week, India's financial capital Mumbai witnessed a drop in air quality, overtaking Delhi several times this month.
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