Lahore and Karachi has been most polluted city.

Lahore ranked first, and Karachi has been second most polluted city on the Air Quality Index (AQI), Sources reported on Monday.

Pakistan’s two biggest cities have got the dubious distinction of soaring to first and second from the top in the most polluted cities of the world on the air pollution measurement scale.

Lahore was measured to have 187 hazardous particulate matter and Karachi 179 particulate matter, according to the air quality index.

It is to be mentioned here that AQI as high as 151-200 is considered unhealthy, while an AQI reading between 201 to 300 is more harmful and AQI over 300 mark is dubbed extremely hazardous.

According to experts, the air becomes heavier in the winter as compared to summer, causing poisonous particles in the atmosphere to move downwards and making the atmosphere polluted. As a result, a layer of polluted particles, including large amounts of carbon and smoke, covers a  

Source/dawn

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