SmogRank / World / United States / Washington / August 2024
Most polluted cities in Washington, United States, August 2024
42 cities in Washington, United States ranked by their average PM2.5 over the 31 days. Worst: Toppenish at 12.8 µg/m³, #249 of 1,962 cities in the world. Cleanest: Tulalip at 3.4. 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.
- 1Toppenish 6%
- 2Prosser 3%
- 3Yakima 3%
- 4Sunnyside 0%
- 5Spokane 0%
- 6Pullman 0%
- 7Ephrata 0%
- 7Walla Walla 0%
- 9Spokane Valley 0%
- 10Moses Lake 0%
- 10White Center 0%
- 12Mead 0%
- 13Tri-Cities 0%
- 14Bellingham 0%
- 15Airway Heights 0%
- 16Quincy 0%
- 17Auburn 0%
- 17Renton 0%
- 17Seattle 0%
- 20Lynden 0%
- 20Shoreline 0%
- 22Ellensburg 0%
- 23North Bend 0%
- 24Ridgefield 0%
- 25Tacoma 0%
- 26Longview 0%
- 27Bellevue 0%
- 27Parkland 0%
- 27Port Angeles 0%
- 27Picnic Point-North Lynnwood 0%
- 31Port Townsend 0%
- 32Bremerton 0%
- 32Chehalis 0%
- 32Mount Vernon 0%
- 35Anacortes 0%
- 35Wenatchee 0%
- 37Shelton 0%
- 38Aberdeen 0%
- 39Lacey 0%
- 40Vancouver 0%
- 41Oak Harbor 0%
- 41Tulalip 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
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SmogRank, most polluted cities in Washington, United States, PM2.5, August 2024, smogrank.com/us/region/washington/history/2024-08 (accessed 6 Oct 2026).
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