Jump to main content or area navigation.

Contact EPA Pacific Southwest

Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

Air Quality Analysis

Air Quality Trends (1970-2018)

Carbon Monoxide Concentrations

"Design Value" - National 8-hour Standard
Highest Second High Day over Two Years

(Click Graph to Enlarge)
Graph showing air pollution concentrations for carbon monoxide - Click to Enlarge
 

Jump to main content.