NASCAR in Chicago: On top of a stretch of hot weather, how will 40 cars racing around downtown at speeds over 100 mph affect air quality?

Growling engines and squealing brakes are an integral part of the allure of auto racing. In less than a week, Chicago will host its first NASCAR street race where elite stock cars that average around 5 mpg in a typical race will be hitting speeds over 100 mph downtown. As race cars turn and brake, as tires screech, fine particulate matter is released into the air. And unlike commuter vehicles, ...

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