As of May 31,
2026, the EPA announced that the number of nonattainment areas
are 45 ozone (8-hour 2015 standard), 34 ozone (8-hour 2008 standard),
4 PM-2.5 (2012 standard), 8 PM-2.5 (2006 standard), 21 PM10 (1987),
23 sulfur dioxide (2010 standard), 7 sulfur dioxide (1971 standard),
1 lead (1978 standard), and 10 lead (2008 standard) in the United
States. There are no CO and NO2 nonattainment areas in the United
States. Maps of the nonattainment
areas are available for review and download.
