'Non-toxic' Normandy gas leak smelt in French capital A gas leak at a chemical plant in the Normandy city of Rouen could be smelt as far away as the French capital, over 100 kilometres (more than 60 miles) away. Officials said Tuesday the gas was "not toxic." Some people on the streets of Paris said they had experienced headaches the night before, while others hadn't noticed a smell. Images and soundbites in Paris.