What is the air quality like in San Francisco?
San Francisco has an average AQI of 48, which falls in the "Good" category. About 62% of days have Good air quality, 30% are Moderate, and 7% are Unhealthy for Sensitive Groups. The primary pollutant is PM2.5.
What is the main pollutant in San Francisco?
The primary pollutant in San Francisco is PM2.5. The city's average PM2.5 level is 8.2 μg/m³ (below the EPA annual standard of 12 μg/m³). Average ozone levels are 38 ppb. Major pollution sources include vehicles, marine vessels.
Is San Francisco affected by wildfire smoke?
San Francisco has a moderate wildfire risk rating. Occasional wildfire smoke events may temporarily degrade air quality.
How many good air quality days does San Francisco have?
Approximately 62% of days in San Francisco have Good air quality (AQI 0-50). This means the majority of the year has clean, breathable air.
When is pollen season in San Francisco's state (CA)?
Pollen seasons in CA include: Grass Pollen (April–July, High severity); Tree Pollen (February–May, High severity); Weed Pollen (July–November, Moderate severity); Mold Spores (Year-round–Year-round, Moderate 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.