Washington Nonattainment/Maintenance Status for Each County by Year for All Criteria Pollutants
Data is current as of March 31, 2025
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 The 8-hour Ozone (1997) standard was revoked on April 6, 2015 and the 1-hour Ozone (1979) standard was revoked on June 15, 2005.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)
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 |
| WASHINGTON |
| Clark County |
1-Hour Ozone (1979)-NAAQS revoked |
Portland-Vancouver AQMA, OR-WA |
| 06/18/1997 |
Marginal |
Part |
410,990 |
53/011 |
| Clark County |
Carbon Monoxide (1971) |
Vancouver, WA |
| 10/21/1996 |
Moderate <= 12.7ppm |
Part |
400,271 |
53/011 |
| King County |
1-Hour Ozone (1979)-NAAQS revoked |
Seattle-Tacoma, WA |
| 11/25/1996 |
Marginal |
Part |
1,931,234 |
53/033 |
| King County |
Carbon Monoxide (1971) |
Seattle-Tacoma, WA |
| 10/11/1996 |
Moderate > 12.7ppm |
Part |
1,693,693 |
53/033 |
| King County |
PM-10 (1987) |
King County; Kent, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
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| 05/14/2001 |
Moderate |
Part |
47,315 |
53/033 |
| King County |
PM-10 (1987) |
King County; Seattle, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
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| 05/14/2001 |
Moderate |
Part |
661,062 |
53/033 |
| Pierce County |
1-Hour Ozone (1979)-NAAQS revoked |
Seattle-Tacoma, WA |
| 11/25/1996 |
Marginal |
Whole |
795,225 |
53/053 |
| Pierce County |
Carbon Monoxide (1971) |
Seattle-Tacoma, WA |
| 10/11/1996 |
Moderate > 12.7ppm |
Part |
697,408 |
53/053 |
| Pierce County |
PM-10 (1987) |
Pierce County; Tacoma, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
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| 05/14/2001 |
Moderate |
Part |
238,725 |
53/053 |
| Pierce County |
PM-2.5 (2006) |
Tacoma, WA |
| 03/12/2015 |
Moderate |
Part |
539,682 |
53/053 |
| Snohomish County |
1-Hour Ozone (1979)-NAAQS revoked |
Seattle-Tacoma, WA |
| 11/25/1996 |
Marginal |
Part |
713,351 |
53/061 |
| Snohomish County |
Carbon Monoxide (1971) |
Seattle-Tacoma, WA |
| 10/11/1996 |
Moderate > 12.7ppm |
Part |
625,609 |
53/061 |
| Spokane County |
Carbon Monoxide (1971) |
Spokane, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
01 |
02 |
03 |
04 |
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| 08/29/2005 |
Serious |
Part |
363,834 |
53/063 |
| Spokane County |
PM-10 (1987) |
Spokane County, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
01 |
02 |
03 |
04 |
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| 08/30/2005 |
Moderate |
Part |
230,807 |
53/063 |
| Thurston County |
PM-10 (1987) |
Thurston County; Cities of Olympia, Tumwater, and Lacey, WA |
| 12/04/2000 |
Moderate |
Part |
98,562 |
53/067 |
| Walla Walla County |
PM-10 (1987) |
Walla Walla County; Wallula, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
01 |
02 |
03 |
04 |
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| 09/26/2005 |
Serious |
Part |
426 |
53/071 |
| Whatcom County |
Sulfur Dioxide (2010) |
Whatcom County, WA |
| 01/16/2025 |
|
Part |
32 |
53/073 |
| Yakima County |
Carbon Monoxide (1971) |
Yakima, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
01 |
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| 12/31/2002 |
Not Classified |
Part |
69,565 |
53/077 |
| Yakima County |
PM-10 (1987) |
Yakima County, WA |
| 92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
00 |
01 |
02 |
03 |
04 |
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| 03/10/2005 |
Moderate |
Part |
69,565 |
53/077 |
Important Notes
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