Annual Air Trends Report

Nationally, concentrations of air pollutants have dropped significantly since 1990:

• Carbon Monoxide (CO) 8-Hour, 81%
• Lead (Pb) 3-Month Average, 88% (from 2010)
• Nitrogen Dioxide (NO2) Annual, 60%
• Nitrogen Dioxide (NO2) 1-Hour, 54%
• Ozone (O3) 8-Hour, 22%
• Particulate Matter 10 microns (PM10) 24-Hour, 34%
• Particulate Matter 2.5 microns (PM2.5) Annual, 42% (from 2000)
• Particulate Matter 2.5 microns (PM2.5) 24-Hour, 42% (from 2000)
• Sulfur Dioxide (SO2) 1-Hour, 90%