SmogRank / World / United States / Washington / May 2024
Most polluted cities in Washington, United States, May 2024
47 cities in Washington, United States ranked by their average PM2.5 over the 31 days. Worst: Renton at 6.7 µg/m³, #1,756 of 2,641 cities in the world. Cleanest: Cheney at 0.7. 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.
- 1Renton 0%
- 2White Center 0%
- 3Tacoma 0%
- 4Seattle 0%
- 5Lynden 0%
- 6Bellingham 0%
- 7Auburn 0%
- 8Port Angeles 0%
- 9Toppenish 0%
- 10Ridgefield 0%
- 10Wenatchee 0%
- 12Port Townsend 0%
- 13Sunnyside 0%
- 14Lacey 0%
- 14Moses Lake 0%
- 16Bremerton 0%
- 17Chehalis 0%
- 17Parkland 0%
- 17Yakima 0%
- 20Spokane 0%
- 20Vancouver 0%
- 22Aberdeen 0%
- 22Longview 0%
- 22Mount Vernon 0%
- 25Prosser 0%
- 26Anacortes 0%
- 26Finley 0%
- 28Walla Walla 0%
- 29Ephrata 0%
- 30Shoreline 0%
- 31Shelton 0%
- 32Mead 0%
- 32North Bend 0%
- 34Airway Heights 0%
- 34Pullman 0%
- 36Oak Harbor 0%
- 36Tri-Cities 0%
- 38Quincy 0%
- 39Bellevue 0%
- 39Spokane Valley 0%
- 41Mill Plain 0%
- 42Fairwood 0%
- 42Issaquah 0%
- 44Tulalip 0%
- 45Ellensburg 0%
- 45Enumclaw 0%
- 47Cheney 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, May 2024 · All cities in United States, May 2024 · Washington now
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SmogRank, most polluted cities in Washington, United States, PM2.5, May 2024, smogrank.com/us/region/washington/history/2024-05 (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.