South Dakota
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High Ozone Days Particle Pollution Groups At Risk  
County
Grade
Wgt.
Avg.
Orange
Days
Red
Days
Purple
Days
Brookings - - - - -
Brown - - - - -
Codington - - - - -
Custer * * * * *
Jackson A 0.0 0 0 0
Meade - - - - -
Minnehaha A 0.0 0 0 0
Pennington A 0.0 0 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.