Delhi’s air quality typically worsens ahead of the onset of winter (AFP Photo/DOMINIQUE FAGET)

New Delhi (AFP) – A public health emergency was declared as choking smog blanketed New Delhi on Tuesday, with authorities ordering the temporary closure of all primary schools in the world’s most polluted capital city.

The US embassy website said levels of the fine pollutants known as PM2.5 that are most harmful to health reached 703 — well over double the threshold of 300 that authorities class as hazardous. Local authorities are warning of worsening conditions in the coming days.

The Indian Medical Association declared a public health emergency as it urged city

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