Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame
Union of Concerned Scientists
MAY 21, 2025
Analyzing vehicle pollution control technologies and testing pollution emissions from vehicles. These are the criteria air pollutants, namely PM 2.5 , ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide and lead. Reviewing health science and making updates of health-based standards such as the NAAQS.
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