text: One of the main reasons the pullution is so bad in Europe is because of the diesel fuels. According to Reuters, "Diesels make up 67 percent of vehicles in France, compared to 53.3 percent average in the rest of Western Europe. Paris had 147 micrograms of particulate matter, Brussels had 114, and London had 79.7. The numbers show that there is a direct correlation between the percent of diesel used, and the amount of pollution in an area.