Photos: Pollution in Paris

Nation & World News

Nearly three-quarters of France is under alert in what the European Environment Agency says is the worst air pollution since 2007.

An electronic road sign on the Paris ring road reads "Pollution" Friday March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers -- 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.

An electronic road sign reads "Pollution" on the Paris ring road, Friday March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers -- 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.

The Eiffel Tower, is barely seen through the smog from Paris, Friday, March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers -- 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.

A city electronic board reads "Pollution, we recommend to children and sensitive people not to practice any sports activity", Friday March 14, 2014 in Paris. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers -- 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.

The center of Paris is seen through the smog, Thursday March 13, 2014, as pollution over the French capital is at high levels. In an official effort intended to curb air pollution, Paris Town Hall announced that residential parking will be free Thursday to encourage drivers to leave their cars at home and take public transportation.

The Eiffel Tower and the Beaugrenelle district, right, are seen through the smog in Paris, Thursday March 13, 2014, as pollution over the French capital is at high levels.

Cranes are seen through the smog in Paris, Thursday March 13, 2014 as pollution over the French capital is at high levels.

The Mirabeau bridge, and the statue of Liberty, are seen through the smog in Paris, Thursday March 13, 2014 as pollution over the French capital is at high levels.

A pigeon flies away with the Saint Vincent de Paul church is seen through the smog in Paris, Thursday, March 13, 2014, as pollution over the French capital is at high levels.

The Saint Vincent de Paul church is seen through the smog in Paris, Thursday, March 13, 2014, as pollution over the French capital is at high levels.

The center of Paris is seen through the smog, Thursday March 13, 2014, as pollution over the French capital is at high levels.

The Eiffel tower and a weather captive balloon are seen through the smog in Paris, Thursday March 13, 2014, as pollution over the French capital is at high levels.

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An electronic road sign on the Paris ring road reads "Pollution" Friday March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers -- 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.

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