Carbon Monoxide (1971) Maintenance Area (Redesignated from Nonattainment) Summary

Data is current as of September 30, 2024

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Classification	Number of Areas	Number of Counties	2010 Population
Serious	7	16	23,548,401
Moderate > 12.7ppm	4	19	18,345,975
Moderate <= 12.7ppm	32	62	25,770,701
Unclassifiable	0	0	0
SUBTOTAL	43	97	67,665,077
Not Classified	34	34	8,145,840
SUBTOTAL	34	34	8,145,840
GRAND TOTAL	77	131	75,810,917

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated