SmogRank / World / United States / Washington / April 2024
Most polluted cities in Washington, United States, April 2024
47 cities in Washington, United States ranked by their average PM2.5 over the 30 days. Worst: White Center at 6.0 µg/m³, #1,647 of 2,482 cities in the world. Cleanest: Cheney at 0.8. 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.
- 1White Center 0%
- 2Renton 0%
- 3Lynden 0%
- 4Seattle 0%
- 5Bellingham 0%
- 6Tacoma 0%
- 7Vancouver 0%
- 8Parkland 0%
- 8Port Angeles 0%
- 10Sunnyside 0%
- 11Auburn 0%
- 11Toppenish 0%
- 13Spokane 0%
- 13Yakima 0%
- 15Chehalis 0%
- 15Lacey 0%
- 15Ridgefield 0%
- 15Wenatchee 0%
- 19Moses Lake 0%
- 19Prosser 0%
- 19Shoreline 0%
- 22Longview 0%
- 23Port Townsend 0%
- 24Bremerton 0%
- 24Mount Vernon 0%
- 26Aberdeen 0%
- 27Ephrata 0%
- 28Finley 0%
- 28Walla Walla 0%
- 30Anacortes 0%
- 30Mead 0%
- 30Shelton 0%
- 33Pullman 0%
- 34Airway Heights 0%
- 34North Bend 0%
- 34Oak Harbor 0%
- 37Tri-Cities 0%
- 38Quincy 0%
- 39Ellensburg 0%
- 39Mill Plain 0%
- 41Spokane Valley 0%
- 42Fairwood 0%
- 43Bellevue 0%
- 43Issaquah 0%
- 45Enumclaw 0%
- 45Tulalip 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, April 2024 · All cities in United States, April 2024 · Washington now
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SmogRank, most polluted cities in Washington, United States, PM2.5, April 2024, smogrank.com/us/region/washington/history/2024-04 (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.