Lahore has again emerged as the most polluted city in the world with its air quality being classed as “hazardous”, according to air quality monitoring platform IQAir. In past few years, air pollution has become one of the most pressing public health and environmental crises facing Pakistan. Various cities of the country, most notably Lahore, deal with smog, especially in the winter months. The phenomenon is attributed mainly to industrial emissions, vehicular pollution, stubble burning and air movement. Lahore was placed at the top of the list of most polluted cities globally on Wednesday morning, with an air quality index (AQI) of 452, while Karachi ranked ninth at 179, according to the IQAir live tracker. Lahore remains at the top of the list of most polluted cities in the world on January 21. — screengrab via IQAir On Tuesday, the platform issued an air quality alert for Pakistan as major cities experienced “unhealthy” to “hazardous” levels of air pollution, posing “serious health risks to residents, espec...