Bay, Michigan Air Quality
Bay County, Michigan (MI)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 42 | 63 | 192 | 229 | 128 | 6 | PM2.5 |
| 2022 | 32 | 55 | 85 | 287 | 67 | 0 | PM2.5 |
| 2021 | 28 | 56 | 86 | 290 | 73 | 0 | PM2.5 |
| 2020 | 22 | 52 | 77 | 325 | 40 | 0 | PM2.5 |
| 2019 | 34 | 55 | 85 | 252 | 64 | 0 | PM2.5 |
| 2018 | 37 | 56 | 85 | 266 | 90 | 0 | PM2.5 |
| 2017 | 36 | 54 | 82 | 279 | 83 | 0 | PM2.5 |
| 2016 | 37 | 56 | 83 | 264 | 91 | 0 | PM2.5 |
| 2015 | 44 | 61 | 82 | 220 | 141 | 0 | PM2.5 |
| 2014 | 45 | 61 | 96 | 205 | 143 | 0 | PM2.5 |
What This Means for Bay County Residents
Bay, Michigan has received an Air Quality Grade of B (77/100) based on a decade of EPA monitoring data. The current median AQI of 42 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 3 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 1 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.