SmogRank / World / United States / Washington / December 2023
Most polluted cities in Washington, United States, December 2023
44 cities in Washington, United States ranked by their average PM2.5 over the 31 days. Worst: White Center at 8.8 µg/m³, #992 of 2,197 cities in the world. Cleanest: Enumclaw at 0.6. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Shelton 3%
- 2White Center 0%
- 3Toppenish 0%
- 4Renton 0%
- 5Yakima 0%
- 6Port Angeles 0%
- 7Sunnyside 0%
- 8Spokane 0%
- 8Tacoma 0%
- 10Auburn 0%
- 10Parkland 0%
- 12Mead 0%
- 13Wenatchee 0%
- 14Seattle 0%
- 15Vancouver 0%
- 16Longview 0%
- 16Shoreline 0%
- 18Tri-Cities 0%
- 19Ellensburg 0%
- 19Moses Lake 0%
- 19Walla Walla 0%
- 22Spokane Valley 0%
- 23Airway Heights 0%
- 24Bellingham 0%
- 25Chehalis 0%
- 26Bremerton 0%
- 26Ridgefield 0%
- 28Ephrata 0%
- 29Aberdeen 0%
- 29Port Townsend 0%
- 31Finley 0%
- 32Lacey 0%
- 32Mill Plain 0%
- 34Mount Vernon 0%
- 35Quincy 0%
- 36Bellevue 0%
- 37Cheney 0%
- 38Pullman 0%
- 39Issaquah 0%
- 40Oak Harbor 0%
- 41North Bend 0%
- 42Anacortes 0%
- 43Tulalip 0%
- 44Enumclaw 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, December 2023 · All cities in United States, December 2023 · Washington now
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SmogRank, most polluted cities in Washington, United States, PM2.5, December 2023, smogrank.com/us/region/washington/history/2023-12 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.