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Global Air Quality Index: Lahore declared most polluted city , Karachi fourth

Lahore has been declared the most polluted city in the world with quality index zooming to beyond 400, according to the Air Quality Index released on Monday.

According to details, Lahore has been placed on the list of the most polluted cities across the world with Karachi figuring fourth on the index.

Air quality in Lahore usually worsens during the winter season from October to February when farmers in the wider Punjab province set light to the remnants of crops, producing smoke that adds to smog.

At the same time, weather changes mean pollutants remain trapped in the air for longer.

On the other hand, PM 2.5 concentration in Lahore air is currently 75.6 times above the WHO annual air quality guideline value.

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