Delhi overtook Lahore on Wednesday to become the world's most polluted city in Swiss group IQAir's live rankings. India's pollution control authority said the national capital's 24-hour air quality index (AQI) score had touched 418.
The pollution levels touched the 'severe' category for the first time this season as temperatures and wind speeds dropped, reducing visibility and affecting some flights. At least eight flights were diverted from the city's Indira Gandhi International Airport, news agency ANI reported.
The Central Pollution Control Board defines an AQI reading of 0-50 as «good», and above 401 as «severe», which affects healthy people and seriously impacts those with existing diseases.
Delhi battles smog- a mix of fog and smoke- every winter as cold air traps dust, emissions, and smoke from farm fires.
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