Lansing Air Quality in September
Across 2019–2025, Lansing's September air quality had a median AQI of 41 (Good) over 210 monitored days in the Lansing-East Lansing, MI area. 0.0% of September days (0 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 55.2% of days. The cleanest September on record here was 2020 (median AQI 36, 0 days above 100) and the worst was 2025 (median 43, 0 days above 100, peak AQI 71).
- Good: 77.1%
- Moderate: 22.9%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Improve Indoor Air Quality
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How is the air in Lansing in September?
Good on a typical day: median AQI 41 across 2019–2025, with 0.0% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓77.1% of September days were Good (AQI 0–50), 22.9% Moderate (51–100).
- ✓0 days of 210 reached AQI 101+; the September peak was 71.
- ✓Best September: 2020; worst September: 2025.
Frequently asked questions
What is the air quality like in Lansing in September?▾
Across 2019–2025, the median daily AQI in Lansing in September was 41 (Good). 77.1% of days were Good, 22.9% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Lansing?▾
A typical September day in Lansing sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
Which pollutant causes Lansing's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 55.2% of September days in Lansing. The highest September AQI recorded in 2019–2025 was 71 (Moderate), in 2025.
Lansing September air quality, year by year
Lansing September air quality by year (Lansing-East Lansing, MI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 41 | 0 | 60 | PM2.5 |
| 2020cleanest | 30 | 36 | 0 | 67 | O3 |
| 2021 | 30 | 40 | 0 | 57 | PM2.5 |
| 2022 | 30 | 42 | 0 | 61 | PM2.5 |
| 2023 | 30 | 43 | 0 | 64 | PM2.5 |
| 2024 | 30 | 42 | 0 | 67 | O3 |
| 2025worst | 30 | 43 | 0 | 71 | O3 |
What September air means in Lansing
A typical September day in Lansing sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
September's median AQI of 41 is in line with Lansing's whole-year median of 40, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Lansing runs in line with the national September norm; 0.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Lansing's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Lansing
The latest EPA AirNow observation puts Lansing's AQI at 28 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Lansing air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Lansing-East Lansing, 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.