Thai capital Bangkok, home to an estimated 11 million people and one of the world's most popular tourist destinations, has been blanketed for days by an unpleasant yellow-grey mix of vehicle fumes, industrial emissions and smoke from agricultural burning.
More than 1.3 million people have fallen sick in Thailand since the start of the year as a result of air pollution, with nearly 200,000 admitted to hospital this week alone, according to the public health ministry.
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