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“Hope Clinic in Granite City, Iliinois, just across the river from St. Louis, continues to see the vast majority of their patients traveling from out of state, most of them from Missouri,” Shariyf said.

In a post on X, the Indian capital's chief minister, Atishi Marlena Singh, said classes will move online until further notice due to a thick smog that has enveloped the city.

Earlier in the month, air pollution in the Pakistani city of Lahore forced officials to temporarily close its primary schools.

At the same time, monitoring by IQAir suggests the neighbouring cities of Gurugram and Noida had hazardous air pollution, as did the northern Indian city of Chandigarh.

A study published in The Lancet in July found that 7.2% of daily deaths in the city could be attributed to fine particulate pollution.