Lansing Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Lansing (Lansing-East Lansing, MI area) was June 29, 2023, when the daily AQI reached 194 (Unhealthy), set by fine particulate matter (PM2.5), in wildfire smoke season. Across 2,557 monitored days in 2019–2025, 6 of the 10 worst days were Unhealthy (AQI 151+) or worse; 10 of the 10 were driven by fine particulate matter (PM2.5), and 6 of them fell in 2023. The cleanest day was February 20, 2025 at AQI 14 (Good); the 10 best days span 6 different years.
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When were Lansing's worst and best air quality days?
Worst: June 29, 2023, AQI 194 (Unhealthy, PM2.5). Best: February 20, 2025, AQI 14 (Good). Based on 2,557 EPA-monitored days in the Lansing-East Lansing, MI area, 2019–2025.
- ✓6 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 123 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) drove 10 of the 10 worst days.
- ✓2023 accounts for 6 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Lansing?▾
June 29, 2023: the Lansing-East Lansing, MI area's daily AQI hit 194 (Unhealthy), driven by fine particulate matter (PM2.5), in wildfire smoke season. That is the highest of 2,557 monitored days in 2019–2025.
What was the best air quality day in Lansing?▾
February 20, 2025, with a daily AQI of 14 (Good). The daily AQI is the highest reading from any monitor in the area, so even the cleanest day reflects the area's worst monitor.
What was Lansing's worst air quality day in 2025?▾
July 31, 2025, AQI 153 (Unhealthy), set by fine particulate matter (PM2.5), in wildfire smoke season.
Which pollutant causes Lansing's worst air days?▾
Fine particulate matter (PM2.5) set the AQI on 10 of the 10 worst days. The tables above list the defining pollutant for every day.
Lansing's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Lansing-East Lansing, MI area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2023 page) | 194 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 2 | (2023 page) | 193 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 3 | (2023 page) | 181 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 4 | (2023 page) | 154 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 5 | (2025 page) | 153 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 6 | (2020 page) | 151 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 7 | (2025 page) | 142 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 8 | (2023 page) | 142 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 9 | (2023 page) | 136 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 10 | (2025 page) | 123 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
Worst day of each year in Lansing
The single highest-AQI day in each year on record. Click a year for its full month-by-month statistics.
| Year | Worst day | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 2019 | 78 | Moderate | PM2.5 — fine particulate matter (PM2.5) | |
| 2020 | 151 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2021 | 100 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2022 | 93 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2023 | 194 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2024 | 85 | Moderate | PM2.5 — fine particulate matter (PM2.5) | |
| 2025 | 153 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
Lansing's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Lansing-East Lansing, MI area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2025 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 2 | (2023 page) | 14 | Good | O3 — ground-level ozone |
| 3 | (2022 page) | 14 | Good | O3 — ground-level ozone |
| 4 | (2022 page) | 14 | Good | O3 — ground-level ozone |
| 5 | (2025 page) | 15 | Good | O3 — ground-level ozone |
| 6 | (2025 page) | 16 | Good | O3 — ground-level ozone |
| 7 | (2024 page) | 16 | Good | O3 — ground-level ozone |
| 8 | (2020 page) | 16 | Good | O3 — ground-level ozone |
| 9 | (2020 page) | 16 | Good | O3 — ground-level ozone |
| 10 | (2019 page) | 16 | Good | O3 — ground-level ozone |
Right now in Lansing
The latest EPA AirNow observation puts Lansing's AQI at 28 (PM2.5). The days above are historical records, 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.