Pollution in Paris
1
Police officers control vehicles along the Seine River in Paris, March 17, 2014.
2
An electronic road sign reads "Road traffic forbidden for even-numbered licence plates" on the Paris ring road, March 17, 2014.
3
Two joggers wearing protective masks run past a police officer at Concorde Square in Paris, March 17, 2014.
4
A general view shows the Centre Pompidou modern art museum and water vapour from a smokestack in Paris, March 17, 2014.