40 C.F.R. § 49.9925
Classification of regions for episode plans.
Cite as 40 C.F.R. § 49.9925 (2026)
The air quality control region which encompasses the Coeur D'Alene Reservation is classified as follows for purposes of episode plans: Pollutant Classification Carbon monoxide III Nitrogen dioxide III Ozone III Particulate matter (PM10) I Sulfur oxides II