San Jose Air Quality in February
Across 2019–2025, San Jose's February air quality had a median AQI of 42 (Good) over 198 monitored days in the San Jose-Sunnyvale-Santa Clara, 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 54.0% of days. The cleanest February on record here was 2025 (median AQI 37, 0 days above 100) and the worst was 2022 (median 58, 0 days above 100, peak AQI 83).
- Good: 63.1%
- Moderate: 36.9%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for San Jose Homes
Air quality in San Jose is moderate (AQI 53), 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.
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How is the air in San Jose in February?
Good on a typical day: median AQI 42 across 2019–2025, with 0.0% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓63.1% of February days were Good (AQI 0–50), 36.9% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 83.
- ✓Best February: 2025; worst February: 2022.
Frequently asked questions
What is the air quality like in San Jose in February?▾
Across 2019–2025, the median daily AQI in San Jose in February was 42 (Good). 63.1% of days were Good, 36.9% 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 Jose?▾
A typical February day in San Jose sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes San Jose's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 54.0% of February days in San Jose. The highest February AQI recorded in 2019–2025 was 83 (Moderate), in 2022.
San Jose February air quality, year by year
San Jose February air quality by year (San Jose-Sunnyvale-Santa Clara, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 39 | 0 | 52 | O3 |
| 2020 | 29 | 52 | 0 | 69 | PM2.5 |
| 2021 | 28 | 51 | 0 | 76 | PM2.5 |
| 2022worst | 28 | 58 | 0 | 83 | PM2.5 |
| 2023 | 28 | 45 | 0 | 62 | PM2.5 |
| 2024 | 29 | 38 | 0 | 70 | O3 |
| 2025cleanest | 28 | 37 | 0 | 44 | O3 |
What February air means in San Jose
A typical February day in San Jose sits in the Good range (median AQI 42), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 42 is below San Jose's whole-year median of 50, 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 Jose runs in line with 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 Jose's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in San Jose
The latest EPA AirNow observation puts San Jose's AQI at 53 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current San Jose air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (San Jose-Sunnyvale-Santa Clara, 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.