San Jose Air Quality in June
Across 2019–2025, San Jose's June air quality had a median AQI of 47 (Good) over 210 monitored days in the San Jose-Sunnyvale-Santa Clara, CA area. 1.4% of June days (3 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 56.2% of days. The cleanest June on record here was 2023 (median AQI 40, 0 days above 100) and the worst was 2019 (median 50, 2 days above 100, peak AQI 136).
- Good: 60.5%
- Moderate: 38.1%
- Unhealthy for Sensitive Groups: 1.4%
- 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.
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 Jose in June?
Good on a typical day: median AQI 47 across 2019–2025, with 1.4% of June days above AQI 100. Ground-level ozone is the main driver.
- ✓60.5% of June days were Good (AQI 0–50), 38.1% Moderate (51–100).
- ✓3 days of 210 reached AQI 101+; the June peak was 136.
- ✓Best June: 2023; worst June: 2019.
Frequently asked questions
What is the air quality like in San Jose in June?▾
Across 2019–2025, the median daily AQI in San Jose in June was 47 (Good). 60.5% of days were Good, 38.1% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is June a good time for outdoor exercise in San Jose?▾
A typical June day in San Jose sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 71 of June days (1.4%) reached AQI 101+ in 2019–2025.
Which pollutant causes San Jose's June air quality problems?▾
Ground-level ozone set the daily AQI on 56.2% of June days in San Jose. The highest June AQI recorded in 2019–2025 was 136 (Unhealthy for Sensitive Groups), in 2019.
San Jose June air quality, year by year
San Jose June 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 |
|---|---|---|---|---|---|
| 2019worst | 30 | 50 | 2 | 136 | PM2.5 |
| 2020 | 30 | 41 | 0 | 64 | O3 |
| 2021 | 30 | 44 | 1 | 129 | O3 |
| 2022 | 30 | 51 | 0 | 87 | O3 |
| 2023cleanest | 30 | 40 | 0 | 77 | O3 |
| 2024 | 30 | 54 | 0 | 74 | PM2.5 |
| 2025 | 30 | 45 | 0 | 67 | O3 |
What June air means in San Jose
A typical June day in San Jose sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 71 of June days (1.4%) reached AQI 101+ in 2019–2025.
June's median AQI of 47 is in line with San Jose's whole-year median of 50, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so San Jose runs in line with the national June norm; 1.4% of its June days topped AQI 100 versus 3.7% nationally (below average).
June is part of San Jose's summer season (June, July, August); the summer 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.