SmogRank / World / United States / Washington / February 2025
Most polluted cities in Washington, United States, February 2025
40 cities in Washington, United States ranked by their average PM2.5 over the 28 days. Worst: Yakima at 9.6 µg/m³, #1,228 of 2,574 cities in the world. Cleanest: Mount Vernon at 1.5. 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%
- 3Port Angeles 0%
- 3Sunnyside 0%
- 5Spokane 0%
- 6Spokane Valley 0%
- 7Wenatchee 0%
- 8Renton 0%
- 9Anacortes 0%
- 9Auburn 0%
- 9Tacoma 0%
- 12Ellensburg 0%
- 13White Center 0%
- 14Prosser 0%
- 14Seattle 0%
- 16Moses Lake 0%
- 16Parkland 0%
- 16Walla Walla 0%
- 19Vancouver 0%
- 20Ephrata 0%
- 20Longview 0%
- 22Lynden 0%
- 23Lacey 0%
- 23Mead 0%
- 25Shelton 0%
- 26Airway Heights 0%
- 26Bellingham 0%
- 28Chehalis 0%
- 28Shoreline 0%
- 30Port Townsend 0%
- 30Ridgefield 0%
- 30Picnic Point-North Lynnwood 0%
- 33Bremerton 0%
- 34Aberdeen 0%
- 35Quincy 0%
- 35Tri-Cities 0%
- 37Pullman 0%
- 38Bellevue 0%
- 38North Bend 0%
- 40Mount Vernon 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, February 2025 · All cities in United States, February 2025 · Washington now
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SmogRank, most polluted cities in Washington, United States, PM2.5, February 2025, smogrank.com/us/region/washington/history/2025-02 (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.