LAHORE: Dense toxic smog blanketed Pakistan’s second biggest city Lahore on Saturday (November 15), with air quality hitting “hazardous” levels and posing a health threat to the city’s millions, particularly those working outdoors and exposed, data from the Swiss group IQAir showed. Lahore recorded an Air Quality Index (AQI) of 344 at 8 am local time (0300 GMT), making it world’s second most polluted city after the Indian capital Delhi among the list of polluted major cities.