Reno Air Quality in September
Across 2019–2025, Reno's September air quality had a median AQI of 52 (Moderate) over 210 monitored days in the Reno, NV area. 11.4% of September days (24 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 69.0% of days. The cleanest September on record here was 2019 (median AQI 46, 0 days above 100) and the worst was 2020 (median 84, 11 days above 100, peak AQI 265).
- Good: 48.6%
- Moderate: 40.0%
- Unhealthy for Sensitive Groups: 3.8%
- Unhealthy or worse: 7.6%
Extra Protection for Reno Homes
Air quality in Reno is moderate (AQI 64), 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 Reno in September?
Moderate on a typical day: median AQI 52 across 2019–2025, with 11.4% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓48.6% of September days were Good (AQI 0–50), 40.0% Moderate (51–100).
- ✓24 days of 210 reached AQI 101+; the September peak was 265.
- ✓Best September: 2019; worst September: 2020.
Frequently asked questions
What is the air quality like in Reno in September?▾
Across 2019–2025, the median daily AQI in Reno in September was 52 (Moderate). 48.6% of days were Good, 40.0% Moderate, and 11.4% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Reno?▾
A typical September day in Reno is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 9 of September days (11.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Reno's September air quality problems?▾
Ground-level ozone set the daily AQI on 69.0% of September days in Reno. The highest September AQI recorded in 2019–2025 was 265 (Very Unhealthy), in 2020.
Reno September air quality, year by year
Reno September air quality by year (Reno, NV, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 46 | 0 | 71 | O3 |
| 2020worst | 30 | 84 | 11 | 265 | PM2.5 |
| 2021 | 30 | 73 | 5 | 134 | O3 |
| 2022 | 30 | 54 | 8 | 259 | PM2.5 |
| 2023 | 30 | 47 | 0 | 64 | O3 |
| 2024 | 30 | 58 | 0 | 87 | O3 |
| 2025 | 30 | 47 | 0 | 58 | O3 |
What September air means in Reno
A typical September day in Reno is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 9 of September days (11.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
September's median AQI of 52 is in line with Reno's whole-year median of 50, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Reno runs above the national September norm; 11.4% of its September days topped AQI 100 versus 2.7% nationally (above average).
September is part of Reno's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Reno
The latest EPA AirNow observation puts Reno's AQI at 64 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Reno air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Reno, NV), 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.