Nearly Half of US Breathes Unhealthy Levels of Pollution—Cars and Trucks Largely to Blame
Union of Concerned Scientists
MAY 21, 2025
Ozone is produced from precursors in the presence of ultraviolet radiation from sunlight, and global warming creates conditions favorable to ozone formation by accelerating chemical reactions. These are the criteria air pollutants, namely PM 2.5 , ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide and lead.
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