text: As mentioned, about fifty percent of the greenhouse gases in America are from cars. Only about 12 percent in Europe. France is one of the most polluted countries in Europe because of it's tax on gasoline, that is not on diesel fuel. Diesels make up 67 percent of France compared to the 53.3 percent average of the rest of Western Europe. Paris has more smog than other European capitals, Paris had 147 micrograms of particulate matter per cubic meter compared to London's 79.7!