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wait.. if brakes are 20% of fine particulate matter traffic pollution and tailpipe emissions are 7%, what's the other 73%?
by purplezooey 3y ago
wait.. if brakes are 20% of fine particulate matter traffic pollution and tailpipe emissions are 7%, what's the other 73%?
- paulkrush 3y agoTires are a big source of fine black particulate matter. It's even worse when your son is trying to create large mathematical symbols in the parking lot.