KARACHI: Karachi again topped list of most polluted cities of world on global Air Quality Index. City’s air quality index was 177 at 11 am that put it in hazardous category with regard to PM (particulate matter) level. AQI as high as 151-200 is considered unhealthy, while an AQI in between 201 to 300 is more harmful and an AQI over 300 is dubbed extremely hazardous.

Yesterday, Punjab’s provincial capital Lahore topped list of most polluted cities in Pakistan. According to experts, air becomes heavier in winter as compared to summer, causing poisonous particles in atmosphere to move downwards and making atmosphere polluted. As a result, a layer of polluted particles, including large amounts of carbon and smoke, covers a city.

Published in The Daily National Courier, October, 22 2022

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