A woman combs though trash, looking for recyclable items, as a cloud of air pollution obscures the Mexico City skyline, Saturday, May 21, 2016. Mexican authorities have issued a new smog alert for the capital after ozone levels rose to almost twice acceptable limits. It's the fifth time this year that Mexico City has seen such an alert, which triggers additional restrictions on automobile usage. On Saturday 40 percent of vehicles have been barred from the streets of the capital and the surrounding suburbs. (AP Photo/Marco Ugarte)
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