Riverside Air Quality in July
Across 2019–2025, Riverside's July air quality had a median AQI of 161 (Unhealthy) over 217 monitored days in the Riverside-San Bernardino-Ontario, CA area. 94.1% of July days (204 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 95.9% of days. The cleanest July on record here was 2022 (median AQI 159, 26 days above 100) and the worst was 2023 (median 190, 31 days above 100, peak AQI 517).
- Good: 0.0%
- Moderate: 6.0%
- Unhealthy for Sensitive Groups: 32.3%
- Unhealthy or worse: 61.8%
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 July?
Unhealthy on a typical day: median AQI 161 across 2019–2025, with 94.1% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓0.0% of July days were Good (AQI 0–50), 6.0% Moderate (51–100).
- ✓204 days of 217 reached AQI 101+; the July peak was 517.
- ✓Best July: 2022; worst July: 2023.
Frequently asked questions
What is the air quality like in Riverside in July?▾
Across 2019–2025, the median daily AQI in Riverside in July was 161 (Unhealthy). 0.0% of days were Good, 6.0% Moderate, and 94.1% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Riverside?▾
A typical July day in Riverside is Unhealthy (median AQI 161): everyone should limit prolonged outdoor exertion, and sensitive groups should avoid it; about 94% of July days (94.1%) were at AQI 101+.
Which pollutant causes Riverside's July air quality problems?▾
Ground-level ozone set the daily AQI on 95.9% of July days in Riverside. The highest July AQI recorded in 2019–2025 was 517 (Hazardous), in 2023.
Riverside July air quality, year by year
Riverside July 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 | 31 | 166 | 31 | 213 | O3 |
| 2020 | 31 | 161 | 30 | 215 | O3 |
| 2021 | 31 | 156 | 30 | 212 | O3 |
| 2022cleanest | 31 | 159 | 26 | 206 | O3 |
| 2023worst | 31 | 190 | 31 | 517 | O3 |
| 2024 | 31 | 201 | 29 | 227 | O3 |
| 2025 | 31 | 136 | 27 | 201 | O3 |
What July air means in Riverside
A typical July day in Riverside is Unhealthy (median AQI 161): everyone should limit prolonged outdoor exertion, and sensitive groups should avoid it; about 94% of July days (94.1%) were at AQI 101+.
July's median AQI of 161 is above Riverside's whole-year median of 89, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Riverside runs above the national July norm; 94.1% of its July days topped AQI 100 versus 3.6% nationally (above average).
July 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.