Maryland
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High Ozone Days Particle Pollution Groups At Risk  
County
Grade
Wgt.
Avg.
Orange
Days
Red
Days
Purple
Days
Anne Arundel F 7.7 20 2 0
Baltimore F 7.8 19 3 0
Baltimore City * * * * *
Calvert * * * * *
Carroll D 2.3 7 0 0
Cecil F 6.2 17 1 0
Charles F 3.7 11 0 0
Frederick C 2.0 6 0 0
Garrett * * * * *
Harford F 11.2 29 3 0
Kent C 2.0 6 0 0
Montgomery D 3.0 9 0 0
Prince George's F 7.7 23 0 0
Washington C 1.3 4 0 0
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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.