1997 PM_2.5 Standards — Region 8 State Designations

Note: EPA no longer updates this information, but it may be useful for historical purposes. See the PM Designations Home Page for more recent information about PM Designations.

Boundary Designations for the 1997 PM_2.5 Standard - EPA Region 8

Map showing PM2.5 designations for 1997 standard for Region 8

This table identifies all counties EPA has designated as nonattainment. In some cases EPA designated partial counties. These are identified by a (P). If a county is not listed below, EPA has designated it as unclassifiable/attainment.

State	Area Name	Counties
Colorado	Entire state is attainment/unclassifiable
Montana	Libby, MT	Lincoln (P)
North Dakota	Entire state is attainment/unclassifiable
South Dakota	Entire state is attainment/unclassifiable
Utah	Entire state is attainment/unclassifiable
Wyoming	Entire state is attainment/unclassifiable

Region 8 Recommendations and EPA Responses

1997 PM2.5 Standards — Region 8 State Designations

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1997 PM_2.5 Standards — Region 8 State Designations