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Massive Fall in Air Pollution During World Championships

For one brilliant week in September 2011, the air pollution levels from car traffic in Copenhagen fell by a whopping 30%. The City of Copenhagen took a bold step in planning the Road Racing World Championships in cycling this year by deciding to close off most of the city centre to car traffic during the event. While most people have tried to calculate the massive boost the event had - and will have - on tourism, Copenhagen's brand and what not, it turns out the event improved the air quality for the citizens of the city. It didn't have anything directly to do with the professional cyclists racing around the city. The ban on cars in the city centre of Copenhagen meant that 60,000 cars and trucks were kept out and 75 streets were car-free. Hans Christian Andersen Boulevard during the World Championships. A few months before the event, I had an idea. I thought about the study done after 9/11 where temperatures were measured in the US for the five days that air traffic was