Additional trend graphs can be found in the annual Air Quality Report.

NAAQS = National Ambient Air Quality Standard

PollutantDesign Value
Carbon Monoxide (CO)2nd highest 8-hour average
Lead (Pb)highest 3-month average
Nitrogen dioxide (NO2)annual average
Ozone (O3)3-year average of the 4th highest daily maximum 8-hour average
Sulfur Dioxide (SO2)99th percentile daily maximum 1-hour concentration