People look out from a viewing area of the 95-storey skyscraper The Shard, the tallest building in Britain at 309.6 metres, in London, Thursday, Jan. 19, 2017. The London mayor's office says the city ... more 
People look out from a viewing area of the 95-storey skyscraper The Shard, the tallest building in Britain at 309.6 metres, in London, Thursday, Jan. 19, 2017. The London mayor's office says the city is experiencing a period of air pollution with pollution readings moderate to high across the city. (AP Photo/Matt Dunham) less 
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Associated Press | Photo By Matt Dunham
Thu, Jan 19, 2017 9:15 AM EST