The list of most polluted cities in the world was again topped by Lahore as its air quality index (AQI) recorded six times manifold over the safe limit. IQAir, a Swiss air technology company data,  that pulls together air quality indices from across the world, Geo News reported that on Monday morning, Lahore was engulfed in a grey haze and recorded an AQI of 306. 

The city's air quality has been classified as "hazardous", it adds the extra burden on the fragile healthcare system amid a surge in coronavirus deaths and new infections. The other city that made the list of the top 10 most polluted cities was Karachi. It ranked seventh with an AQI of 168. The Swiss air quality monitor regards air quality as satisfactory if the AQI is below 50. 

Pakistan which is experiencing second wave of corona, may impose lockdown any time. The worst spread combining with the air pollution is a great threat to the people and the national healthcare. 

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