On November 8 in the southern Pakistani city of Multan — more than two hundred miles from Lahore — the AQI exceeded 2,000. Ahmad Rafay Alam is an environmental lawyer in Lahore and has long been at the forefront of clean air activism in Pakistan.

Toxic smog in India and Pakistan has caused air quality in the major metropolitans of Lahore, Multan, Delhi and Chandigarh to deteriorate to toxic levels.

The satellite images show an extremely heavy grey smog over Pakistan. It stretches into northern parts of India, albeit is lighter than the one over its neighbouring country.

PM IST Delhi's air quality turned 'severe' for the first time this season on Wednesday, with the AQI soaring to 418. The national capital also overtook the Pakistani city Lahore to become the world's most polluted city in Swiss group IQAir's live rankings.

Delhi overtook Pakistan ’s Lahore as the world’s most polluted city in Swiss group IQAir’s live rankings, with an air quality index (AQI) score of more than 1,000, which is considered “hazardous”, but India ’s pollution authority said the AQI was around 350.

Delhi and its neighbouring cities are experiencing pollution levels that are at least 30-35 times the safe limit recommended by the World Health Organization (WHO). Every year, De