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Air Quality Index in San Francisco, CA

San Francisco is a vibrant city known for its iconic landmarks like the Golden Gate Bridge and Alcatraz Island. It has a mild climate but air quality can vary. The air quality index in San Francisco is often good but during certain times especially in the summer and fall wildfires nearby can cause air pollution leading to poor air quality.

Air Quality Index

February 16, 2025
Low
Good
Good

Air quality is ideal, with minimal or no risk to health.

NO2
Good
PM2.5
Good
M10
Good
O3
Fair

Air Quality Index

February 17, 2025
Low
Fair
Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO2
Good
PM2.5
Good
M10
Good
O3
Fair

Air Quality Index

February 18, 2025
Low
Moderate
Moderate

Members of sensitive groups, such as children, the elderly, and individuals with respiratory conditions, may experience adverse health effects. The general population is less likely to be affected.

NO2
Good
PM2.5
Good
M10
Good
O3
Moderate

Air Quality Index

February 19, 2025
Low
Fair
Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO2
Good
PM2.5
Good
M10
Good
O3
Fair

Air Quality Index

February 20, 2025
Low
Moderate
Moderate

Members of sensitive groups, such as children, the elderly, and individuals with respiratory conditions, may experience adverse health effects. The general population is less likely to be affected.

NO2
Good
PM2.5
Good
M10
Good
O3
Moderate

Air Quality Index

February 21, 2025
Low
Fair
Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO2
Good
PM2.5
Good
M10
Good
O3
Fair

5-Day Air Quality Index Forecast in San Francisco, CA

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Tips to Protect Yourself from Unhealthy Air Quality in San Francisco, CA

Close all windows and doors to keep polluted air from coming inside. If possible, use an air purifier to remove harmful particles from the indoor air.

If you need to go outside, wear a high-quality mask like an N95 or KN95. These masks are designed to filter out tiny particles in the air, including smoke and dust.

Pay attention to local air quality reports and limit your time outside if the air quality index is unhealthy.

FAQ

Frequently Asked Questions
  • When is AQI usually the worst in San Francisco?

    Air quality in San Francisco is typically at its worst during the winter months, particularly in January, November, and December. These months often experience higher levels of particulate matter (PM2.5) due to increased heating and wood burning, as well as thermal inversions that trap air pollution near the ground.

  • What are common pollutants that impact AQI in San Francisco?

    The main pollutants affecting air quality in San Francisco include particulate matter (PM2.5 and PM10), nitrogen oxides (NOₓ), carbon monoxide (CO), Sulfur dioxide (SO₂) and volatile organic compounds (VOCs).

  • Are there specific areas in San Francisco, CA with better AQI?

    Air quality can vary across different neighborhoods in San Francisco due to factors like traffic density, industrial activities, and local weather patterns. Generally, areas with less vehicular traffic and fewer industrial sources tend to have better air quality. For instance, neighborhoods like the Richmond District and parts of the Sunset District often experience better air quality compared to areas near major highways or industrial zones. However, air quality can change rapidly, so it's advisable to check real-time air quality data for specific locations.