Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame
Union of Concerned Scientists
MAY 21, 2025
are formed indirectly in the atmosphere from other toxic pollutants also emitted from tailpipes. Since then, there has been much progress in cleaning up our air, the result of effective environmental policies that control combustion emissions from sources such as power plants, industry, ports, warehouses and our vast network of roads.
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