Seattle Air Quality Moderate Amid Lingering Smoke

Seattle recorded a Moderate air quality index (AQI) of 58 on Friday, September 5, driven by elevated particulate levels from regional wildfire smoke.

Seattle’s skies remained hazy as PM2.5 averaged 13 µg/m³ and PM10 reached 43 µg/m³ by mid-afternoon, prompting health advisories for sensitive groups.

Earlier in the day, AQI dipped to 52 at 10:09 AM before climbing to a 24-hour high of 63 at 11:09 PM on September 4. Conditions reflect persistent smoke drifting into Western Washington from ongoing fires east of the Cascades.

City officials advise residents with respiratory or heart conditions to limit prolonged outdoor exertion, especially during peak afternoon hours when pollutant concentrations rise. Forecast models suggest an incoming weather system over the weekend may bring rain, potentially clearing the air by Monday.

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