Indianapolis Air Quality in March
Across 2019–2025, Indianapolis's March air quality had a median AQI of 55 (Moderate) over 217 monitored days in the Indianapolis-Carmel-Anderson, IN area. 0.5% of March days (1 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 78.3% of days. The cleanest March on record here was 2025 (median AQI 52, 0 days above 100) and the worst was 2022 (median 50, 1 day above 100, peak AQI 109).
- Good: 33.2%
- Moderate: 66.4%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Extra Protection for Indianapolis Homes
Air quality in Indianapolis is moderate (AQI 55), 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.
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How is the air in Indianapolis in March?
Moderate on a typical day: median AQI 55 across 2019–2025, with 0.5% of March days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓33.2% of March days were Good (AQI 0–50), 66.4% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the March peak was 109.
- ✓Best March: 2025; worst March: 2022.
Frequently asked questions
What is the air quality like in Indianapolis in March?▾
Across 2019–2025, the median daily AQI in Indianapolis in March was 55 (Moderate). 33.2% of days were Good, 66.4% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Indianapolis?▾
A typical March day in Indianapolis is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Indianapolis's March air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 78.3% of March days in Indianapolis. The highest March AQI recorded in 2019–2025 was 109 (Unhealthy for Sensitive Groups), in 2022.
Indianapolis March air quality, year by year
Indianapolis March air quality by year (Indianapolis-Carmel-Anderson, IN, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 57 | 0 | 80 | PM2.5 |
| 2020 | 31 | 56 | 0 | 76 | PM2.5 |
| 2021 | 31 | 58 | 0 | 99 | PM2.5 |
| 2022worst | 31 | 50 | 1 | 109 | PM2.5 |
| 2023 | 31 | 62 | 0 | 88 | PM2.5 |
| 2024 | 31 | 54 | 0 | 74 | PM2.5 |
| 2025cleanest | 31 | 52 | 0 | 87 | PM2.5 |
What March air means in Indianapolis
A typical March day in Indianapolis is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
March's median AQI of 55 is in line with Indianapolis's whole-year median of 56, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Indianapolis runs above the national March norm; 0.5% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Indianapolis's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Indianapolis
The latest EPA AirNow observation puts Indianapolis's AQI at 55 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Indianapolis air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Indianapolis-Carmel-Anderson, IN), 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.