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Oregon Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants

Data is current as of November 30, 2024

Listed by County, NAAQS, Area. The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.

* The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)

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Important Notes Download National Dataset: dbf   |   xls    |   Data dictionary (PDF)
County NAAQS Area Name Nonattainment in Year Redesignation
to Maintenance		 Classification Whole or/
Part County		 Population
(2010)		 State/
County
FIPS Codes
OREGON
Clackamas County 1-Hour Ozone (1979)-NAAQS revoked Portland-Vancouver AQMA, OR-WA
92 93 94 95 96                                                                                                                                            
06/18/1997 Marginal Part 373,166 41/005
Clackamas County Carbon Monoxide (1971) Portland, OR
92 93 94 95 96                                                                                                                                            
10/02/1997 Moderate <= 12.7ppm Part 233,262 41/005
Jackson County Carbon Monoxide (1971) Medford, OR
92 93 94 95 96 97 98 99 00 01                                                                                                                   
09/23/2002 Moderate <= 12.7ppm Part 86,056 41/029
Jackson County PM-10 (1987) Jackson County; Medford-Ashland (including White City), OR
92 93 94 95 96 97 98 99 00 01 02 03 04 05                                                                                               
08/18/2006 Moderate Part 87,458 41/029
Josephine County Carbon Monoxide (1971) Grants Pass, OR
92 93 94 95 96 97 98 99                                                                                                                             
10/30/2000 Moderate <= 12.7ppm Part 22,449 41/033
Josephine County PM-10 (1987) Josephine County; Grants Pass, OR
92 93 94 95 96 97 98 99 00 01 02                                                                                                              
12/26/2003 Moderate Part 22,449 41/033
Klamath County Carbon Monoxide (1971) Klamath Falls, OR
92 93 94 95 96 97 98 99 00                                                                                                                        
11/19/2001 Moderate <= 12.7ppm Part 20,703 41/035
Klamath County PM-10 (1987) Klamath Falls, OR
92 93 94 95 96 97 98 99 00 01 02                                                                                                              
12/22/2003 Moderate Part 20,703 41/035
Klamath County PM-2.5 (2006) Klamath Falls, OR
                                                                                     09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
/ / Moderate Part 46,969 41/035
Lake County PM-10 (1987) Lake County (part); Lakeview, OR
     93 94 95 96 97 98 99 00 01 02 03 04 05                                                                                               
07/19/2006 Moderate Part 3,296 41/037
Lane County Carbon Monoxide (1971) Eugene-Springfield, OR
92 93                                                                                                                                                           
02/04/1994 Not Classified Part 234,972 41/039
Lane County PM-10 (1987) Lane County; Eugene/Springfield, OR
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12                                                            
06/10/2013 Moderate Part 195,160 41/039
Lane County PM-10 (1987) Lane County (part); Oakridge, OR
          94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21               
09/21/2022 Moderate Part 3,728 41/039
Lane County PM-2.5 (2006) Oakridge, OR
                                                                                     09 10 11 12 13 14 15 16 17 18 19 20 21               
09/21/2022 Moderate Part 4,261 41/039
Marion County 1-Hour Ozone (1979)-NAAQS revoked Salem, OR
92 93 94 95 96 97 98 99 00 01 02 03 04                                                                                                    
/ / Incomplete Data Part 313,385 41/047
Marion County Carbon Monoxide (1971) Salem, OR
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08                                                                                
03/02/2009 Not Classified Part 80,695 41/047
Multnomah County 1-Hour Ozone (1979)-NAAQS revoked Portland-Vancouver AQMA, OR-WA
92 93 94 95 96                                                                                                                                            
06/18/1997 Marginal Part 377,954 41/051
Multnomah County Carbon Monoxide (1971) Portland, OR
92 93 94 95 96                                                                                                                                            
10/02/1997 Moderate <= 12.7ppm Part 629,654 41/051
Polk County 1-Hour Ozone (1979)-NAAQS revoked Salem, OR
92 93 94 95 96 97 98 99 00 01 02 03 04                                                                                                    
/ / Incomplete Data Part 75,179 41/053
Polk County Carbon Monoxide (1971) Salem, OR
92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08                                                                                
03/02/2009 Not Classified Part 75,405 41/053
Union County PM-10 (1987) Union County; LaGrande, OR
92 93 94 95 96 97 98 99 00 01 02 03 04 05                                                                                               
07/19/2006 Moderate Part 13,094 41/061
Washington County 1-Hour Ozone (1979)-NAAQS revoked Portland-Vancouver AQMA, OR-WA
92 93 94 95 96                                                                                                                                            
06/18/1997 Marginal Part 510,250 41/067
Washington County Carbon Monoxide (1971) Portland, OR
92 93 94 95 96                                                                                                                                            
10/02/1997 Moderate <= 12.7ppm Part 467,557 41/067
Important Notes

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