Riverside Air Quality in November
Across 2019–2025, Riverside's November air quality had a median AQI of 71 (Moderate) over 210 monitored days in the Riverside-San Bernardino-Ontario, CA area. 14.8% of November days (31 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 75.7% of days. The cleanest November on record here was 2023 (median AQI 61, 2 days above 100) and the worst was 2021 (median 87, 10 days above 100, peak AQI 155).
- Good: 5.2%
- Moderate: 80.0%
- Unhealthy for Sensitive Groups: 13.8%
- Unhealthy or worse: 1.0%
Extra Protection for Riverside Homes
Air quality in Riverside is moderate (AQI 56), 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 November?
Moderate on a typical day: median AQI 71 across 2019–2025, with 14.8% of November days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓5.2% of November days were Good (AQI 0–50), 80.0% Moderate (51–100).
- ✓31 days of 210 reached AQI 101+; the November peak was 170.
- ✓Best November: 2023; worst November: 2021.
Frequently asked questions
What is the air quality like in Riverside in November?▾
Across 2019–2025, the median daily AQI in Riverside in November was 71 (Moderate). 5.2% of days were Good, 80.0% Moderate, and 14.8% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is November a good time for outdoor exercise in Riverside?▾
A typical November day in Riverside is Moderate (median AQI 71): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 7 of November days (14.8%) 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 November air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 75.7% of November days in Riverside. The highest November AQI recorded in 2019–2025 was 170 (Unhealthy), in 2021.
Riverside November air quality, year by year
Riverside November 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 | 76 | 9 | 129 | PM2.5 |
| 2020 | 30 | 81 | 2 | 150 | PM2.5 |
| 2021worst | 30 | 87 | 10 | 155 | PM2.5 |
| 2022 | 30 | 66 | 2 | 119 | PM2.5 |
| 2023cleanest | 30 | 61 | 2 | 143 | PM2.5 |
| 2024 | 30 | 65 | 3 | 170 | PM2.5 |
| 2025 | 30 | 68 | 3 | 109 | PM2.5 |
What November air means in Riverside
A typical November day in Riverside is Moderate (median AQI 71): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 7 of November days (14.8%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
November's median AQI of 71 is below Riverside's whole-year median of 89, making it one of the area's cleaner periods. Nationally, the median November AQI across every EPA metro area (92,704 metro-days, 2019–2025) is 39, so Riverside runs above the national November norm; 14.8% of its November days topped AQI 100 versus 0.6% nationally (above average).
November is part of Riverside's fall season (September, October, November); the fall 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 56 (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.