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The Eiffel Tower in central Paris peers through a haze of pollution on Friday. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers today as all public transportation in the Paris region and two other cities is free for the next three days.
Nearly three-quarters of France is under alert in what the European Environment Agency says is the worst air pollution since 2007. Levels in the Parisian region are even surpassing those in some of the world’s most notoriously polluted cities, including Beijing and Delhi.