A picture taken on December 5, 2016 in Paris shows the Eiffel tower in the smog. Pollution reaches a peak in Paris on December 5, 2016. (Photo/Agencies)
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A picture taken on December 5, 2016 in Paris shows the Eiffel tower in the smog. Pollution reaches a peak in Paris on December 5, 2016. (Photo/Agencies)
