Riverside Air Quality in Spring
Across 2019–2025, Riverside's spring (March–May) air quality had a median AQI of 82 (Moderate) over 644 monitored days in the Riverside-San Bernardino-Ontario, CA area. 34.4% of spring days (222 of 644) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 66.0% of days. The cleanest spring on record here was 2019 (median AQI 73, 18 days above 100) and the worst was 2022 (median 93, 40 days above 100, peak AQI 1683).
- Good: 9.2%
- Moderate: 56.4%
- Unhealthy for Sensitive Groups: 24.8%
- Unhealthy or worse: 9.6%
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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Riverside in spring?
Moderate on a typical day: median AQI 82 across 2019–2025, with 34.4% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓9.2% of spring days were Good (AQI 0–50), 56.4% Moderate (51–100).
- ✓222 days of 644 reached AQI 101+; the spring peak was 1683.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Riverside in spring?▾
Across 2019–2025, the median daily AQI in Riverside in spring was 82 (Moderate). 9.2% of days were Good, 56.4% Moderate, and 34.4% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Riverside?▾
A typical spring day in Riverside is Moderate (median AQI 82): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of spring days (34.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Riverside's spring air quality problems?▾
Ground-level ozone set the daily AQI on 66.0% of spring days in Riverside. The highest spring AQI recorded in 2019–2025 was 1683 (Hazardous), in 2022.
Riverside spring air quality, year by year
Riverside spring 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 |
|---|---|---|---|---|---|
| 2019cleanest | 92 | 73 | 18 | 150 | O3 |
| 2020 | 92 | 76 | 31 | 212 | O3 |
| 2021 | 92 | 92 | 38 | 329 | O3 |
| 2022worst | 92 | 93 | 40 | 1683 | O3 |
| 2023 | 92 | 79 | 34 | 660 | O3 |
| 2024 | 92 | 80 | 26 | 193 | O3 |
| 2025 | 92 | 87 | 35 | 174 | O3 |
What spring air means in Riverside
A typical spring day in Riverside is Moderate (median AQI 82): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of spring days (34.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Spring's median AQI of 82 is below Riverside's whole-year median of 89, making it one of the area's cleaner periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Riverside runs above the national Spring norm; 34.4% of its Spring days topped AQI 100 versus 0.8% nationally (above average).
Within the season, March is the cleanest month (median AQI 61, 5.9% of days above 100) and May the worst (median 105, 57.6% above 100).
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 season 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.