Air pollution in New Delhi worsened again Sunday and officials warned of little relief in sight from the smog, which has even caused one airline to cancel flights to the world's most polluted capital.

The US embassy website Sunday showed levels of the smallest and most harmful airborne pollutants reached 676, about 27 times the World Health Organization's safe maximum, after falling slightly late last week.

Delhi authorities have halted all construction, shut brick kilns and banned lorries from entering the city but pollution levels have remained stubbornly high, hovering around hazardous levels for six days in the city and other parts of north India.

An effort to restrict private cars collapsed Saturday after India's top environmental court objected to exemptions for women, VIPs and motorcycles.

The city government will appeal the decision on Monday.

Doctors have declared a public health emergency and more than 30,000 schools across northern India have closed, though classes are scheduled to resume Monday.

Air quality typically worsens before the onset of winter as cooler air traps pollutants near the ground and prevents them from dispersing into the atmosphere, a phenomenon known as inversion.

The meteorological department said Sunday more foggy weather was expected in coming days, and rain forecast for Wednesday would do little to clear the skies.

"It may help subside the smog a little. But it will be light rain, drizzle, not heavy showers. So, maybe it might not help that much," Mrutyunjay Mohapatra, additional director general of meteorology, told AFP.

United Airlines has suspended all flights to Delhi from Newark until Monday due to the air quality and was offering alternatives to passengers booked on the route to India, the US airline said on its website.

The filthy air, with little wind to disperse it, partly stems from the annual post-harvest burning of crop stubble in India's northern farming states of Punjab and Haryana. The level of dangerous pollutants in the air has soared.

Doctors say microscopic particles known as PM2.5 -- which spiked at over 1,000 on Wednesday in Delhi -- can penetrate deep into the lungs, increasing the risk of heart attacks and strokes.

Some hospitals in Delhi are reporting patient numbers have more than tripled since a dense layer of smog settled over the city of 20 million last week.

Temporary measures to curb pollution have so far had little effect.

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Delhi smog shortening lives, say doctors as hospitals fill up
New Delhi (AFP) Nov 12, 2017
In the emergency ward of a Delhi hospital, men and women gasp for breath as they wait to be treated for symptoms triggered by the choking blanket of smog that descended on the Indian capital this week. Doctors at the government-run Vallabhbhai Patel Chest Institute say patient numbers have more than tripled since pollution levels spiked amid a change in weather conditions and the annual post ... read more

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