San Diego Air Quality in February
Across 2019–2025, San Diego's February air quality had a median AQI of 59 (Moderate) over 198 monitored days in the San Diego-Carlsbad, CA area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 72.2% of days. The cleanest February on record here was 2019 (median AQI 52, 0 days above 100) and the worst was 2025 (median 69, 0 days above 100, peak AQI 100).
- Good: 22.7%
- Moderate: 77.3%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for San Diego Homes
Air quality in San Diego is moderate (AQI 54), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in San Diego in February?
Moderate on a typical day: median AQI 59 across 2019–2025, with 0.0% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓22.7% of February days were Good (AQI 0–50), 77.3% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 100.
- ✓Best February: 2019; worst February: 2025.
Frequently asked questions
What is the air quality like in San Diego in February?▾
Across 2019–2025, the median daily AQI in San Diego in February was 59 (Moderate). 22.7% of days were Good, 77.3% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in San Diego?▾
A typical February day in San Diego is Moderate (median AQI 59): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes San Diego's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 72.2% of February days in San Diego. The highest February AQI recorded in 2019–2025 was 100 (Moderate), in 2025.
San Diego February air quality, year by year
San Diego February air quality by year (San Diego-Carlsbad, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 28 | 52 | 0 | 71 | PM2.5 |
| 2020 | 29 | 64 | 0 | 86 | PM2.5 |
| 2021 | 28 | 67 | 0 | 85 | PM2.5 |
| 2022 | 28 | 55 | 0 | 74 | PM2.5 |
| 2023 | 28 | 57 | 0 | 94 | PM2.5 |
| 2024 | 29 | 56 | 0 | 82 | PM2.5 |
| 2025worst | 28 | 69 | 0 | 100 | PM2.5 |
What February air means in San Diego
A typical February day in San Diego is Moderate (median AQI 59): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
February's median AQI of 59 is below San Diego's whole-year median of 67, making it one of the area's cleaner periods. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so San Diego runs above the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of San Diego's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in San Diego
The latest EPA AirNow observation puts San Diego's AQI at 54 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current San Diego air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (San Diego-Carlsbad, CA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.