SmogRank / World / United States / Washington / January 2024
Most polluted cities in Washington, United States, January 2024
44 cities in Washington, United States ranked by their average PM2.5 over the 31 days. Worst: Yakima at 11.0 µg/m³, #784 of 2,341 cities in the world. Cleanest: Enumclaw at 0.4. 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.
- 1Yakima 0%
- 2Toppenish 0%
- 3Sunnyside 0%
- 4Renton 0%
- 5Port Angeles 0%
- 6Walla Walla 0%
- 7Wenatchee 0%
- 7Tri-Cities 0%
- 9White Center 0%
- 10Auburn 0%
- 11Ellensburg 0%
- 11Tacoma 0%
- 13Parkland 0%
- 14Finley 0%
- 15Longview 0%
- 16Spokane 0%
- 17Vancouver 0%
- 18Moses Lake 0%
- 19Shoreline 0%
- 20Seattle 0%
- 21Bellingham 0%
- 22Spokane Valley 0%
- 23Chehalis 0%
- 24Mead 0%
- 25Bremerton 0%
- 25Shelton 0%
- 27Lacey 0%
- 28Port Townsend 0%
- 29Airway Heights 0%
- 29Ephrata 0%
- 31Ridgefield 0%
- 32Lynden 0%
- 33Aberdeen 0%
- 34Mount Vernon 0%
- 35Quincy 0%
- 36Mill Plain 0%
- 37Bellevue 0%
- 38Oak Harbor 0%
- 39Cheney 0%
- 40Issaquah 0%
- 40North 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, January 2024 · All cities in United States, January 2024 · Washington now
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SmogRank, most polluted cities in Washington, United States, PM2.5, January 2024, smogrank.com/us/region/washington/history/2024-01 (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.