Metro area air quality · 2024
Monroe, MI
Median AQI 18 (Good). 94.9% of monitored days rated Good across this metro's EPA monitoring network.
- 18
- Median AQI
- 94.9%
- Good-air days
- 0
- Unhealthy days
Monroe, MI posted a 2024 median AQI of 18 (Good) with 94.9% Good days
According to the U.S. EPA Air Quality System, the Monroe, MI CBSA recorded a median AQI of 18 across 59 monitored days in 2024, with 94.9% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Closest median-AQI peer
- Americus, GA (93.4% Good, median AQI 38) is the closest nationwide median-AQI peer to Monroe, MI.
- 2020–2024 Good-day shift
- Monroe, MI's Good-day share moved -0.2 points from 2020 to 2024 (median AQI +1).
- Median AQI
- Median AQI: 18
- Good days
- Good days: 94.9%
Aggregated from EPA Air Quality System (2024), 59 monitored days. EPA AQS →
The verdict
Monroe, MI sits in the upper Good-day tercile among EPA CBSA metros on this site (94.9% of 59 monitored days). On the EPA scale the metro runs good, with a median AQI of 18 and 94.9% of 59 monitored days in the Good band.
- 18
- median AQI · Good
- 94.9%
- days rated Good
- 77
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2024.
Monroe, MI sits in the upper Good-day tercile among EPA CBSA metros on this site (94.9% of 59 monitored days). Signature read: 94.9% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 18 over 59 measured days in 2024 (Good / Excellent). The monitored-day split lands at 56 Good (95%), 3 Moderate (5%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 41; the highest single-day reading hit 77 (Moderate).
Across 2020–2024, Good-day share shifted -0.2 points and median AQI moved +1 (tracked). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Americus, GA (93.4% good, AQI 38); Summerville, GA (96.3% good, AQI 39); Ada, OK (71.6% good, AQI 43).
Air Quality Summary
Median AQI
18
Good
Good Days
94.9%
56 of 59 days
Max AQI
77
Moderate
Health Grade
Excellent
90th pct: 41
AQI Day Breakdown (2024)
Distribution of 59 monitored days across EPA AQI categories.
Good
56
95%
Moderate
3
5%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Monroe, MI metro area's air quality is rated Excellent based on 94.9% good air days. No unhealthy air days were recorded in 2024.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Monroe, MI metro compare?
How Monroe, MI compares
5-Year Air Quality Trend
Air quality is being tracked in the Monroe, MI metro.
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 58 | 3 | 0 | 17 | 66 |
| 2021 | 57 | 4 | 0 | 19 | 77 |
| 2022 | 51 | 8 | 0 | 26 | 607 |
| 2023 | 59 | 6 | 0 | 25 | 82 |
| 2024 | 56 | 3 | 0 | 18 | 77 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Monroe, MI (18).
Frequently Asked Questions
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Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Monroe, MI, 2024. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Monroe, MI · 2020–2025