Riverside Air Quality in June
Across 2019–2025, Riverside's June air quality had a median AQI of 142 (Unhealthy for Sensitive Groups) over 210 monitored days in the Riverside-San Bernardino-Ontario, CA area. 77.7% of June days (163 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 94.3% of days. The cleanest June on record here was 2023 (median AQI 97, 13 days above 100) and the worst was 2024 (median 153, 27 days above 100, peak AQI 201).
- Good: 0.0%
- Moderate: 22.4%
- Unhealthy for Sensitive Groups: 36.7%
- Unhealthy or worse: 41.0%
Extra Protection for Riverside Homes
Air quality in Riverside is moderate (AQI 58), 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 Riverside in June?
Unhealthy for Sensitive Groups on a typical day: median AQI 142 across 2019–2025, with 77.7% of June days above AQI 100. Ground-level ozone is the main driver.
- ✓0.0% of June days were Good (AQI 0–50), 22.4% Moderate (51–100).
- ✓163 days of 210 reached AQI 101+; the June peak was 584.
- ✓Best June: 2023; worst June: 2024.
Frequently asked questions
What is the air quality like in Riverside in June?▾
Across 2019–2025, the median daily AQI in Riverside in June was 142 (Unhealthy for Sensitive Groups). 0.0% of days were Good, 22.4% Moderate, and 77.7% 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 Riverside?▾
A typical June day in Riverside is already Unhealthy for Sensitive Groups (median AQI 142): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 78% of June days (77.7%) were at that level or worse.
Which pollutant causes Riverside's June air quality problems?▾
Ground-level ozone set the daily AQI on 94.3% of June days in Riverside. The highest June AQI recorded in 2019–2025 was 584 (Hazardous), in 2024.
Riverside June air quality, year by year
Riverside June air quality by year (Riverside-San Bernardino-Ontario, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 138 | 23 | 192 | O3 |
| 2020 | 30 | 142 | 24 | 584 | O3 |
| 2021 | 30 | 161 | 26 | 216 | O3 |
| 2022 | 30 | 147 | 27 | 200 | O3 |
| 2023cleanest | 30 | 97 | 13 | 201 | O3 |
| 2024worst | 30 | 153 | 27 | 201 | O3 |
| 2025 | 30 | 151 | 23 | 207 | O3 |
What June air means in Riverside
A typical June day in Riverside is already Unhealthy for Sensitive Groups (median AQI 142): people with asthma or heart disease, children and older adults should reduce prolonged outdoor exertion on most days, and about 78% of June days (77.7%) were at that level or worse.
June's median AQI of 142 is above Riverside's whole-year median of 89, making it one of the area's dirtier periods. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so Riverside runs above the national June norm; 77.7% of its June days topped AQI 100 versus 3.7% nationally (above average).
June is part of Riverside's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Riverside
The latest EPA AirNow observation puts Riverside's AQI at 58 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Riverside air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Riverside-San Bernardino-Ontario, 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.