PM-2.5 (2012) Designated Area Design Values

Data is current as of November 30, 2025

PM-2.5 (2012) Notes Design Values in µg/m³. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

Display:       Nonattainment and Maintenance Areas       Nonattainment Areas       Maintenance Areas

Click underlined column heading to change report order	Design Values at the Time of Designation		Current Design Values as of 05/28/2025 (2022-2024)
Area Name	Annual Design Values	Monitoring Years	Annual Design Values	Meets NAAQS Determin.1	Current Status	class sort	Current Classification or at Redesignation	2010 Population
click area name for state/county list							click for classif. history
Allegheny County, PA	13.0	2012-2014	10.6	Yes	Nonattainment	B	Moderate	1,223,348
Cleveland, OH	12.4	2012-2014	11.2	Yes	Maintenance	B	Moderate	1,581,478
Delaware County, PA	12.3	2012-2014	8.1	Yes	Maintenance	B	Moderate	558,979
Imperial County, CA	14.3	2012-2014	10.2	Yes	Nonattainment	B	Moderate	154,061
Lebanon County, PA	12.7	2012-2014	8.2	Yes	Maintenance	B	Moderate	133,568
Los Angeles-South Coast Air Basin, CA	14.6	2012-2014	12.9	No	Nonattainment	A	Serious	15,716,242
Plumas County, CA	14.1	2012-2014	12.3	No	Nonattainment	A	Serious	5,843
San Joaquin Valley, CA	19.7	2012-2014	14.7	No	Nonattainment	A	Serious	3,842,165
West Silver Valley, ID	13.1	2012-2014	9.4	Yes	Maintenance	B	Moderate	7,497

¹ See the Air Quality Design Value site spreadsheet footnotes for information about "Insufficient Data" Meets NAAQS Determinations.

PM-2.5 (2012) Notes Design Values in µg/m³. "Current Design Values" are current as of the posted Green Book date. Check the Air Quality Design Value site for design value updates.

Multi-state areas are counted in maintenance totals when all states in the area have been redesignated.

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