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French gendarmes and firemen walk in the Lubrizol factory on January 22, 2013 in the Normandy city of Rouen after a gas leak at the chemical plant cast a strong odor that wafted from northern France as far as Paris. Authorities insisted that the gas, mercaptan, was harmless, but emergency lines were inundated with calls from people worried about the smell. The company said on January 22 it should within hours be able to plug the leak that began a day earlier and whose odours were blown by winds as far as the streets of the capital, over 100 kms (60 miles) away. AFP PHOTO / CHARLY TRIBALLEAU (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)