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Air Quality Index in San Diego, CA

San Diego is known for its beautiful beaches and mild climate. While the air quality is generally good, it can sometimes be affected by factors like traffic, wildfires, and pollution from nearby industries.

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
Good

Air Quality Index

February 17, 2025
Low
Poor
Poor

Everyone may begin to experience health effects, and sensitive groups may face more serious issues.

NO2
Good
PM2.5
Fair
M10
Fair
O3
Poor

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
Very Poor
Very Poor

A health alert indicating that everyone may experience serious effects from air pollution.

NO2
Good
PM2.5
Fair
M10
Fair
O3
Poor

Air Quality Index

February 21, 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

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

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

When the air quality is poor, spend as much time indoors as possible. Keep windows and doors closed, and use air purifiers to help clean the air inside your home.

Avoid outdoor exercise or any strenuous activities during high pollution days. If you need to go outside, try to do it during times when pollution levels are lower, like early morning or late evening.

Check the air quality index regularly and consider wearing a mask designed for air pollution (like an N95 mask) to protect your lungs when the AQI is high.

FAQ

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

    The AQI in San Diego is usually the worst during the summer and fall, especially when wildfires occur. Wildfires in nearby areas can cause a lot of smoke, which lowers air quality. High traffic and increased temperatures can also worsen the AQI during these months.

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

    Common pollutants that affect the AQI in San Diego include particulate matter (PM2.5), ozone, and nitrogen dioxide (NO2). PM2.5 comes from car exhaust, wildfires, and other sources. Ozone forms when sunlight reacts with vehicle emissions and industrial pollution. NO2 is released by cars and industrial facilities and contributes to air pollution.

  • Are there specific areas in San Diego with better AQI?

    Areas farther from traffic and industrial zones tend to have better air quality in San Diego. Coastal areas and higher elevation spots, such as parts of the city near the mountains, often have cleaner air. In contrast, areas near major freeways, urban centers, or industrial zones may experience worse air quality due to pollution from vehicles and businesses.