What is the air quality like in Seattle?
Seattle has an average AQI of 42, which falls in the "Good" category. About 68% of days have Good air quality, 26% are Moderate, and 5% are Unhealthy for Sensitive Groups. The primary pollutant is PM2.5.
What is the main pollutant in Seattle?
The primary pollutant in Seattle is PM2.5. The city's average PM2.5 level is 7.2 μg/m³ (below the EPA annual standard of 12 μg/m³). Average ozone levels are 34 ppb. Major pollution sources include vehicles, marine vessels, wildfires.
Is Seattle affected by wildfire smoke?
Seattle has a moderate wildfire risk rating. Occasional wildfire smoke events may temporarily degrade air quality.
How many good air quality days does Seattle have?
Approximately 68% of days in Seattle have Good air quality (AQI 0-50). This means the majority of the year has clean, breathable air.
When is pollen season in Seattle's state (WA)?
Pollen seasons in WA include: Tree Pollen (February–May, High severity); Weed Pollen (July–October, Moderate severity); Grass Pollen (May–August, High severity); Mold Spores (Year-round–Year-round, High severity). Allergy sufferers should monitor pollen counts during these periods and consider staying indoors on high-pollen days, especially during morning hours when counts peak.