Grand Rapids Air Quality in Fall
Across 2019–2025, Grand Rapids's fall (September–November) air quality had a median AQI of 43 (Good) over 637 monitored days in the Grand Rapids-Wyoming, MI area. 0.2% of fall days (1 of 637) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 67.3% of days. The cleanest fall on record here was 2019 (median AQI 30, 0 days above 100) and the worst was 2021 (median 46, 1 day above 100, peak AQI 143).
- Good: 62.0%
- Moderate: 37.8%
- Unhealthy for Sensitive Groups: 0.2%
- Unhealthy or worse: 0.0%
Extra Protection for Grand Rapids Homes
Air quality in Grand Rapids is moderate (AQI 53), 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 Grand Rapids in fall?
Good on a typical day: median AQI 43 across 2019–2025, with 0.2% of fall days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓62.0% of fall days were Good (AQI 0–50), 37.8% Moderate (51–100).
- ✓1 day of 637 reached AQI 101+; the fall peak was 143.
- ✓Cleanest month: November; worst month: September.
Frequently asked questions
What is the air quality like in Grand Rapids in fall?▾
Across 2019–2025, the median daily AQI in Grand Rapids in fall was 43 (Good). 62.0% of days were Good, 37.8% Moderate, and 0.2% reached Unhealthy for Sensitive Groups or worse, based on 637 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Grand Rapids?▾
A typical fall day in Grand Rapids sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Which pollutant causes Grand Rapids's fall air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 67.3% of fall days in Grand Rapids. The highest fall AQI recorded in 2019–2025 was 143 (Unhealthy for Sensitive Groups), in 2021.
Grand Rapids fall air quality, year by year
Grand Rapids fall air quality by year (Grand Rapids-Wyoming, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 91 | 30 | 0 | 69 | O3 |
| 2020 | 91 | 31 | 0 | 70 | O3 |
| 2021worst | 91 | 46 | 1 | 143 | PM2.5 |
| 2022 | 91 | 49 | 0 | 99 | PM2.5 |
| 2023 | 91 | 47 | 0 | 87 | PM2.5 |
| 2024 | 91 | 49 | 0 | 100 | PM2.5 |
| 2025 | 91 | 51 | 0 | 87 | PM2.5 |
What fall air means in Grand Rapids
A typical fall day in Grand Rapids sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Fall's median AQI of 43 is below Grand Rapids's whole-year median of 51, making it one of the area's cleaner periods. Nationally, the median Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Grand Rapids runs in line with the national Fall norm; 0.2% of its Fall days topped AQI 100 versus 1.5% nationally (below average).
Within the season, November is the cleanest month (median AQI 39, 0.0% of days above 100) and September the worst (median 48, 0.5% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Grand Rapids
The latest EPA AirNow observation puts Grand Rapids's AQI at 53 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Grand Rapids air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Grand Rapids-Wyoming, MI), 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.