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Pollution in Delhi has risen to 24 times the level of safety.
The situation may get worse because of concerns about setting off firecrackers on Diwali.
Air quality in smog in India
The northern region, including the capital, has deteriorated sharply today due to bad weather and increased smoke from burning stubble in the area's fields.
Experts warn that due to the use of firecrackers during Diwali, smog will worsen in the next few days.
After yesterday's wind boost, air quality improved earlier on Monday and is expected to be worse in the coming days. Levels of PM 2.
5. tiny particles that can go deep into the lungs and cause major health problems exceed 400 in most parts of the capital, soaring to more than 600 in some places.
This is almost 24 times the recommended level of 25 micrograms per cubic meter.
The World Health Organization has set an hour, which this year says India is home to 14 of the world's most polluted cities.
The New Delhi area is the most polluted area in the world.
Anumita Roy Chowdhury, executive director of the Center for Science and environment-
In two particularly bad states, farmers burn stubble in the fields to prepare for winter planting, he said.
"The wind speed has dropped from 29 to 15 kilometers per hour, and crop stubble burning has increased significantly over the past few hours in Punjab and Haryana," she said.
Authorities have warned that the burning of crop residue will peak in the next few days, which has exacerbated Indian concerns about celebrating Diwali on Wednesday and could exacerbate smog pollution.
Many members of most Hindu communities will set off to celebrate firecrackers during the festival of lights.
Diwali is the most important Hindu festival in North India, celebrating justice over evil.
In the past few years, air pollution has risen to a dangerous level after many firecrackers have been set off.
Shamika Ravi, a member of the Prime Minister's Economic Advisory Committee, said on Twitter today: "Delhi has not heard any firecrackers, but the air purifier is burning red --
It shows the level of danger of pollution.
# No simple problem.
Aqa India, India's air quality monitoring agency, wrote on Twitter: "Delhi is currently experiencing the worst air quality so far this year.
This morning, the live video camera took this photo of Connaught Square, which looks like a ghost.
The Supreme Court last month allowed Diwali to use "green" firecrackers in an attempt to control pollution, but it was not clear how the rule would be enforced and whether there were environmental safety fireworks.
Lower winter temperatures and higher humidity, combined with lower wind speeds, tend to catch contaminants in the atmosphere, Roy Chowdhury added.
The Indian tropical meteorological institute also said changes in wind speed and wind direction, as well as more stubble burning, made the air more toxic.
The company and industry officials said that due to increasing public awareness of the health impact of pollution, sales of air purifiers increased by 40% over last year.
New Delhi and its satellite cities account for the majority of air purifier sales, but they are growing in other cities such as Mumbai and Bangladesh.
Unilever, Blue Air, Honeywell International and British Dyson dominate the air purifier market.