Riverside Air Quality in 2024
In 2024, Riverside's air quality (Riverside-San Bernardino-Ontario, CA area) had a median daily AQI of 97 (Moderate) across 366 monitored days. 164 days (44.8%) reached Unhealthy for Sensitive Groups or worse, 26 were Good, and the year's peak AQI was 593 (Hazardous). Ground-level ozone set the daily AQI on 205 of those days. The cleanest month of 2024 was March (median AQI 55, 0 days above 100) and the worst was July (median 201, 29 days above 100, peak 227).
- Good: 7.1%
- Moderate: 48.1%
- Unhealthy for Sensitive Groups: 18.0%
- Unhealthy or worse: 26.8%
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 was Riverside's air quality in 2024?
Moderate on a typical day: median AQI 97, with 164 days above AQI 100 out of 366 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 593 (Hazardous).
- ✓Ground-level ozone was the main pollutant on 205 days.
- ✓Cleanest month: March; worst: July.
Frequently asked questions
What was the average AQI in Riverside in 2024?▾
EPA's Air Quality System puts Riverside's (Riverside-San Bernardino-Ontario, CA) median daily AQI for 2024 at 97, which is Moderate. 164 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 593.
Which month had the worst air quality in Riverside in 2024?▾
The cleanest month of 2024 was March (median AQI 55, 0 days above 100) and the worst was July (median 201, 29 days above 100, peak 227).
Was 2024 a good or bad year for Riverside's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 5th cleanest by days above AQI 100. 2024's median of 97 is above the area's typical annual median of 89.
Riverside month by month in 2024
Riverside air quality month by month, 2024 (Riverside-San Bernardino-Ontario, CA, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 64 | 2 | 110 | PM2.5 |
| February | 29 | 58 | 0 | 94 | PM2.5 |
| Marchcleanest | 31 | 55 | 0 | 100 | O3 |
| April | 30 | 88 | 11 | 193 | O3 |
| May | 31 | 100 | 15 | 169 | O3 |
| June | 30 | 153 | 27 | 201 | O3 |
| Julyworst | 31 | 201 | 29 | 227 | O3 |
| August | 31 | 156 | 25 | 205 | O3 |
| September | 30 | 162 | 25 | 593 | O3 |
| October | 31 | 119 | 18 | 204 | O3 |
| November | 30 | 65 | 3 | 170 | PM2.5 |
| December | 31 | 82 | 9 | 157 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 5th cleanest by days above AQI 100.
2024's median of 97 is above the area's typical annual median of 89.
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 annual 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.