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The Indian capital declared a pollution emergency and banned the entry of trucks and construction activity as a toxic smog hung over the city for a third day on Thursday and air quality worsened by the hour.

Illegal crop burning in the farm states surrounding New Delhi, vehicle exhaust emissions in a city with limited public transport and swirling construction dust have caused the crisis, which arises every year.

The problem has been compounded this year by still conditions, the weather office said.

A U.S. embassy measure of tiny particulate matter PM 2.5 showed a reading of 608 at 10 a.m. when the safe limit is 50. An hour before it was 591.

PM 2.5 is a particulate matter about 30 times finer than a human hair. The particles can be inhaled deep into the lungs, causing heart attacks, strokes, lung cancer, and respiratory diseases.

Residents complained of headaches, coughs and smarting eyes. Many stayed home and restaurants in some of the city’s most crowded parts were deserted.

“I’d like to assure people that the central government shall do everything possible to bring about improvement in air quality in Delhi and the Nation Capital Region,” federal environment minister Harsh Vardhan said as authorities faced criticism for failing to take steps to fight a problem that erupts every year.

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