North Dakota
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High Ozone Days Particle Pollution Groups At Risk  
County
Grade
Wgt.
Avg.
Orange
Days
Red
Days
Purple
Days
Billings A 0.0 0 0 0
Burke A 0.0 0 0 0
Burleigh * * * * *
Cass A 0.0 0 0 0
Dunn A 0.0 0 0 0
Mc Kenzie A 0.0 0 0 0
Mercer A 0.0 0 0 0
Oliver 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.