Carbon Monoxide Maintenance Area Summary

As of August 30, 2011

	Number of		Population
Classification	Areas	Counties

Serious	7	16	20,974,843
Moderate > 12.7ppm	4	19	17,575,606
Moderate <= 12.7ppm	32	64	23,612,340

SUBTOTAL:	43	97	62,162,789

Not Classified	34	40	7,616,176

SUBTOTAL:	34	40	7,616,176


GRAND TOTAL:	77	131	69,778,965

County and area subtotals and grand totals may not equal sum of parts. Part counties are only counted one time within groupings. Area totals only include full maintenance areas for a multi-state area. The Oshkosh Wisconsin area is not included in the totals above. In the August 17, 1994 Federal Register, EPA redesignated Oshkosh from unclassifiable to attainment for carbon monoxide (effective on October 17,

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order). The Subpart 1 areas in the Greenbook are listed as "Former Subpart 1" until reclassification of the areas is finalized. Proposed reclassifications were published on January 16, 2009 74 FR 2936

Carbon Monoxide Maintenance Area Summary

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