In Pictures: Delhi Overtakes Lahore As World's Most Polluted City As Air Quality Drops
The air quality index (AQI) in Delhi was "hazardous" at 334, making it the most polluted major global city, according to Swiss group IQAir, which measures air quality levels based on the concentration of toxins.
Recommended For YouAn AQI reading up to 50 is considered good with little or no health risk.
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India's official Central Pollution Control Board pegged the AQI higher at 403 and rated it "severe".
The Swiss and Indian readings vary due to the different AQI scales and methodologies used to calculate and classify air pollution levels.
Cars and motorcycles emerged from dense smog, which also appeared to obscure streetlights on the city's main roads, videos from news agency ANI showed.
Pollution is a seasonal problem in many parts of northern India and neighbouring Pakistan, as the cold, heavy air of winter traps vehicle emissions, construction dust and smoke from agricultural burning.
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