Grand Rapids Air Quality in 2021
In 2021, Grand Rapids's air quality (Grand Rapids-Wyoming, MI area) had a median daily AQI of 51 (Moderate) across 365 monitored days. 5 days (1.4%) reached Unhealthy for Sensitive Groups or worse, 176 were Good, and the year's peak AQI was 143 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 243 of those days. The cleanest month of 2021 was March (median AQI 42, 0 days above 100) and the worst was June (median 49, 2 days above 100, peak 108).
- Good: 48.2%
- Moderate: 50.4%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.0%
Extra Protection for Grand Rapids Homes
Air quality in Grand Rapids is moderate (AQI 58), 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 was Grand Rapids's air quality in 2021?
Moderate on a typical day: median AQI 51, with 5 days above AQI 100 out of 365 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 143 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 243 days.
- ✓Cleanest month: March; worst: June.
Frequently asked questions
What was the average AQI in Grand Rapids in 2021?▾
EPA's Air Quality System puts Grand Rapids's (Grand Rapids-Wyoming, MI) median daily AQI for 2021 at 51, which is Moderate. 5 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 143.
Which month had the worst air quality in Grand Rapids in 2021?▾
The cleanest month of 2021 was March (median AQI 42, 0 days above 100) and the worst was June (median 49, 2 days above 100, peak 108).
Was 2021 a good or bad year for Grand Rapids's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 4th cleanest by days above AQI 100. 2021's median of 51 is in line with the area's typical annual median of 51.
Grand Rapids month by month in 2021
Grand Rapids air quality month by month, 2021 (Grand Rapids-Wyoming, MI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 54 | 0 | 85 | PM2.5 |
| February | 28 | 52 | 0 | 88 | PM2.5 |
| Marchcleanest | 31 | 42 | 0 | 83 | PM2.5 |
| April | 30 | 43 | 1 | 107 | PM2.5 |
| May | 31 | 49 | 0 | 67 | O3 |
| Juneworst | 30 | 49 | 2 | 108 | O3 |
| July | 31 | 63 | 1 | 108 | PM2.5 |
| August | 31 | 58 | 0 | 87 | PM2.5 |
| September | 30 | 43 | 1 | 143 | PM2.5 |
| October | 31 | 46 | 0 | 73 | PM2.5 |
| November | 30 | 50 | 0 | 72 | PM2.5 |
| December | 31 | 51 | 0 | 75 | PM2.5 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 4th cleanest by days above AQI 100.
2021's median of 51 is in line with the area's typical annual median of 51.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Grand Rapids
The latest EPA AirNow observation puts Grand Rapids's AQI at 58 (PM2.5). The figures above are multi-year annual 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.