DESIGNATIONS IN US EPA REGION 9 FOR THE
2010 PRIMARY 1-HOUR SULFUR DIOXIDE (S02)
NATIONAL AMBIENT AIR QUALITY STANDARDS
Areas being addressed in separate future actions51.
The primary national ambient air quality standard (NAAQS)for 1-hour sulfur
dioxide (S02) is 75 parts per billion (ppb). Air quality monitors in each area
designated 'Nonattainment' have measured violations of the S02NAAQS.
*Includes Commonwealth of Northern Mariana Islands and American Samoa
(not shown on this map).
(2012), 78 FR 47191 (August 5, 2013), ESRI (2006), TANA (2006). &EPA

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