Lahore city was rated the world's most polluted city on Monday for the second time in a week, based on information provided by the Swiss technology firm IQAir. The thick smog shrouding the city has hit hazardous levels, well beyond the safety standards provided by the World Health Organisation (WHO).

Lahore's Air Quality Index (AQI) jumped to a toxic 312 as the level of PM2.5—the most harmful particulate matter—hit a scary 190.5 micrograms per cubic meter.

Pollution Levels 25 Times Over WHO Standards

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IQAir said Lahore's present concentration of PM2.5 is over 25 times WHO's annual air quality guideline. The real-time ranks saw various locations in the city exceed the hazardous level.

On Monday evening at 10 p.m. local time, Lahore emerged as the world

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