Colorado
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High Ozone Days Particle Pollution Groups At Risk  
County
Grade
Wgt.
Avg.
Orange
Days
Red
Days
Purple
Days
Adams A 0.0 0 0 0
Arapahoe B 0.7 2 0 0
Archuleta - - - - -
Boulder C 1.0 3 0 0
Delta - - - - -
Denver B 0.3 1 0 0
Douglas C 2.0 6 0 0
El Paso B 0.3 1 0 0
Elbert - - - - -
Gunnison - - - - -
Jefferson D 2.7 8 0 0
La Plata A 0.0 0 0 0
Larimer C 2.0 6 0 0
Mesa - - - - -
Montezuma A 0.0 0 0 0
Pueblo - - - - -
Routt - - - - -
San Miguel - - - - -
Weld B 0.7 2 0 0
Donate
American Lung Association State of the Air: 2008 NOTES

(1) * indicates incomplete monitoring data for all three years. Therefore, those counties are excluded from the grade analysis.
(2) A dash (-) indicates that there is no monitor collecting data in the county.

More about Methodology.