Intro:
A dense layer of smog continues to choke eastern Pakistan, where Lahore has topped global pollution charts with a hazardous air quality index of 267.
Each winter, as temperatures fall, the toxic haze engulfs much of the region, triggering a recurring environmental crisis.
Hira Mustafa reports from Islamabad.
In: In a bid...
Out: SOC
Dur: 48 sec
