SmogRank / World / United States / Washington / September 2024
Most polluted cities in Washington, United States, September 2024
42 cities in Washington, United States ranked by their average PM2.5 over the 30 days. Worst: Pullman at 8.7 µg/m³, #620 of 1,964 cities in the world. Cleanest: Tulalip at 2.4. 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.
- 1Pullman 0%
- 2Toppenish 0%
- 3White Center 0%
- 4Spokane 0%
- 5Walla Walla 0%
- 6Renton 0%
- 6Sunnyside 0%
- 8Prosser 0%
- 9Auburn 0%
- 10Bellingham 0%
- 11Seattle 0%
- 12Spokane Valley 0%
- 13Airway Heights 0%
- 13Ephrata 0%
- 13Yakima 0%
- 16Moses Lake 0%
- 17Shoreline 0%
- 18Mead 0%
- 19North Bend 0%
- 19Tacoma 0%
- 21Port Angeles 0%
- 21Tri-Cities 0%
- 23Lynden 0%
- 24Ridgefield 0%
- 25Picnic Point-North Lynnwood 0%
- 26Parkland 0%
- 27Longview 0%
- 27Quincy 0%
- 29Anacortes 0%
- 30Chehalis 0%
- 31Bellevue 0%
- 31Ellensburg 0%
- 31Shelton 0%
- 31Vancouver 0%
- 35Lacey 0%
- 35Port Townsend 0%
- 37Bremerton 0%
- 37Wenatchee 0%
- 39Aberdeen 0%
- 40Mount Vernon 0%
- 41Oak Harbor 0%
- 42Tulalip 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, September 2024, smogrank.com/us/region/washington/history/2024-09 (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.