Modesto Air Quality in November
Across 2019–2025, Modesto's November air quality had a median AQI of 65 (Moderate) over 210 monitored days in the Modesto, CA area. 4.8% of November days (10 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 86.7% of days. The cleanest November on record here was 2024 (median AQI 50, 0 days above 100) and the worst was 2021 (median 77, 3 days above 100, peak AQI 110).
- Good: 24.8%
- Moderate: 70.5%
- Unhealthy for Sensitive Groups: 4.8%
- Unhealthy or worse: 0.0%
Extra Protection for Modesto Homes
Air quality in Modesto is moderate (AQI 63), with particle pollution 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 Modesto in November?
Moderate on a typical day: median AQI 65 across 2019–2025, with 4.8% of November days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓24.8% of November days were Good (AQI 0–50), 70.5% Moderate (51–100).
- ✓10 days of 210 reached AQI 101+; the November peak was 146.
- ✓Best November: 2024; worst November: 2021.
Frequently asked questions
What is the air quality like in Modesto in November?▾
Across 2019–2025, the median daily AQI in Modesto in November was 65 (Moderate). 24.8% of days were Good, 70.5% Moderate, and 4.8% 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 Modesto?▾
A typical November day in Modesto is Moderate (median AQI 65): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 21 of November days (4.8%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Modesto's November air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 86.7% of November days in Modesto. The highest November AQI recorded in 2019–2025 was 146 (Unhealthy for Sensitive Groups), in 2021.
Modesto November air quality, year by year
Modesto November air quality by year (Modesto, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 80 | 2 | 114 | PM2.5 |
| 2020 | 30 | 71 | 2 | 108 | PM2.5 |
| 2021worst | 30 | 77 | 3 | 110 | PM2.5 |
| 2022 | 30 | 66 | 3 | 146 | PM2.5 |
| 2023 | 30 | 68 | 0 | 93 | PM2.5 |
| 2024cleanest | 30 | 50 | 0 | 89 | PM2.5 |
| 2025 | 30 | 59 | 0 | 95 | PM2.5 |
What November air means in Modesto
A typical November day in Modesto is Moderate (median AQI 65): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 21 of November days (4.8%) 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 65 is above Modesto's whole-year median of 54, making it one of the area's dirtier periods. Nationally, the median November AQI across every EPA metro area (92,704 metro-days, 2019–2025) is 39, so Modesto runs above the national November norm; 4.8% of its November days topped AQI 100 versus 0.6% nationally (above average).
November is part of Modesto's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Modesto
The latest EPA AirNow observation puts Modesto's AQI at 63 (PM10). The figures above are multi-year month statistics, not today's reading.
View current Modesto air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Modesto, 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.