'Maybe the smog can bring us together': toxic air chokes Pakistan and India

With Lahore suffering from air pollution almost equal to that enveloping Delhi, joint action to tackle the problem is urgently needed, say environmentalists

Parts of Pakistan have been enveloped by deadly smog in recent weeks, with the city of Lahore suffering almost as badly as the Indian capital Delhi.

Pictures and video that show Lahore looking like an apocalyptic landscape have left people in shock. Some residents have said they can't see beyond their outstretched arm.