As of August
31, 2026, the EPA announced that the number of nonattainment
areas are 47 ozone (8-hour 2015 standard), 36 ozone (8-hour 2008
standard), 4 PM-2.5 (2012 standard), 8 PM-2.5 (2006 standard),
21 PM10 (1987), 22 sulfur dioxide (2010 standard), 7 sulfur dioxide
(1971 standard), 1 lead (1978 standard), and 9 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.
