SmogRank / World / United States / Washington / May 2023
Most polluted cities in Washington, United States, May 2023
46 cities in Washington, United States ranked by their average PM2.5 over the 31 days. Worst: White Center at 7.9 µg/m³, #920 of 1,543 cities in the world. Cleanest: Tulalip at 1.2. 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%
- 2Kent 0%
- 3Mount Vernon 0%
- 3Spokane Valley 0%
- 5Renton 0%
- 5Spokane 0%
- 5Toppenish 0%
- 8Seattle 0%
- 9Sunnyside 0%
- 10Tacoma 0%
- 10Wenatchee 0%
- 12Auburn 0%
- 12Ephrata 0%
- 14Moses Lake 0%
- 14Vancouver 0%
- 16Pullman 0%
- 17Airway Heights 0%
- 18Bellingham 0%
- 18Mead 0%
- 18Port Angeles 0%
- 18Prosser 0%
- 18Yakima 0%
- 23Ellensburg 0%
- 23Parkland 0%
- 23Shoreline 0%
- 26Ridgefield 0%
- 27Bremerton 0%
- 27Walla Walla 0%
- 29Cheney 0%
- 30Chehalis 0%
- 31Quincy 0%
- 32Port Townsend 0%
- 32Shelton 0%
- 34North Bend 0%
- 35Aberdeen 0%
- 35Mill Plain 0%
- 35Tri-Cities 0%
- 38Bellevue 0%
- 39Anacortes 0%
- 40Enumclaw 0%
- 40Lacey 0%
- 42Finley 0%
- 42Longview 0%
- 42Lynden 0%
- 45Oak Harbor 0%
- 46Tulalip 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 2023 · All cities in United States, May 2023 · Washington now
Use this board
SmogRank, most polluted cities in Washington, United States, PM2.5, May 2023, smogrank.com/us/region/washington/history/2023-05 (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.