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Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame

Union of Concerned Scientists

are formed indirectly in the atmosphere from other toxic pollutants also emitted from tailpipes. percent of US CO 2 emissions , are all from fossil fuel combustion in our vehicles, with the vast majority coming from pick-up trucks, SUVs and cars. Internal combustion vehicles are largely to blame, since PM 2.5 Secondary PM 2.5

Ozone 236