Grand Rapids Air Quality in December
Across 2019–2025, Grand Rapids's December air quality had a median AQI of 46 (Good) over 217 monitored days in the Grand Rapids-Wyoming, MI area. 0.0% of December days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 73.3% of days. The cleanest December on record here was 2020 (median AQI 27, 0 days above 100) and the worst was 2022 (median 56, 0 days above 100, peak AQI 80).
- Good: 57.1%
- Moderate: 42.9%
- Unhealthy for Sensitive Groups: 0.0%
- 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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Grand Rapids in December?
Good on a typical day: median AQI 46 across 2019–2025, with 0.0% of December days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓57.1% of December days were Good (AQI 0–50), 42.9% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the December peak was 89.
- ✓Best December: 2020; worst December: 2022.
Frequently asked questions
What is the air quality like in Grand Rapids in December?▾
Across 2019–2025, the median daily AQI in Grand Rapids in December was 46 (Good). 57.1% of days were Good, 42.9% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is December a good time for outdoor exercise in Grand Rapids?▾
A typical December day in Grand Rapids sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
Which pollutant causes Grand Rapids's December air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 73.3% of December days in Grand Rapids. The highest December AQI recorded in 2019–2025 was 89 (Moderate), in 2022.
Grand Rapids December air quality, year by year
Grand Rapids December air quality by year (Grand Rapids-Wyoming, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 39 | 0 | 89 | PM2.5 |
| 2020cleanest | 31 | 27 | 0 | 65 | O3 |
| 2021 | 31 | 51 | 0 | 75 | PM2.5 |
| 2022worst | 31 | 56 | 0 | 80 | PM2.5 |
| 2023 | 31 | 45 | 0 | 74 | PM2.5 |
| 2024 | 31 | 51 | 0 | 72 | PM2.5 |
| 2025 | 31 | 50 | 0 | 63 | PM2.5 |
What December air means in Grand Rapids
A typical December day in Grand Rapids sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
December's median AQI of 46 is below Grand Rapids's whole-year median of 51, making it one of the area's cleaner periods. Nationally, the median December AQI across every EPA metro area (95,590 metro-days, 2019–2025) is 39, so Grand Rapids runs above the national December norm; 0.0% of its December days topped AQI 100 versus 0.7% nationally (about the same).
December is part of Grand Rapids's winter season (December, January, February); the winter page pools all three months.
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 month 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.