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In Western U.S., health risks from ground-level ozone and fine particulate matter continue to grow, study shows

After decades of air quality improvement due to the Clean Air Act of 1970 and other regulations since, the Western U.S. is experiencing an increase in the number of days with extremely high levels of two key types of air pollutants, UCLA study shows. Read more

https://newsroom.ucla.edu/releases/hazardous-air-pollutants-western-states