China and India have greeted the start of climate change talks in Paris with their capitals enshrouded in thick brown smog, a product of runaway economic growth.
In Beijing and New Delhi, both plagued by smog for much of the past month, children have been kept indoors at schools and sales of air filter and face masks have boomed
High levels of vehicle and industrial emissions have combined with smoke from heating in north China, and in northern India with agricultural fires.
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