Levels of the most dangerous PM2.5 fine pollutants are off the scale in some areas of India’s capital

A public health emergency has been declared in Delhi as a choking blanket of smog descended on the world’s most polluted capital city.

The declaration from the Indian Medical Association (IMA) came as the US embassy website said levels of the fine pollutants known as PM2.5 that are most harmful to health reached 703 micrograms per cubic metre – well over double the threshold of 300 that authorities class as hazardous.

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