Ozone
Article
March 26, 2026
Comparing the air pollution in different American cities: Which urban areas have the worst and best air? Explore the most polluted U.S. cities, from Bakersfield and parts of Los Angeles to the cleanest urban areas, and learn what drives air quality and how cities can improve it.
Article
A deep dive into traffic-related air pollution (TRAP). Which air pollutants come from vehicle traffic? Learn about traffic-related air pollutants like particulate matter, nitrogen oxides, carbon monoxide, and VOCs, plus their health impacts and reduction strategies.
Article
Transportation modes and fuel types: Which ones are best for air quality? Explore how gasoline, diesel, electric, and human-powered transportation affect air quality. Learn which travel options produce the least air pollution and what it means for healthier cities.