Indianapolis Air Quality in 2024
In 2024, Indianapolis's air quality (Indianapolis-Carmel-Anderson, IN area) had a median daily AQI of 55 (Moderate) across 366 monitored days. 5 days (1.4%) reached Unhealthy for Sensitive Groups or worse, 129 were Good, and the year's peak AQI was 138 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 262 of those days. The cleanest month of 2024 was April (median AQI 48, 0 days above 100) and the worst was October (median 64, 2 days above 100, peak 138).
- Good: 35.2%
- Moderate: 63.4%
- Unhealthy for Sensitive Groups: 1.4%
- 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 was Indianapolis's air quality in 2024?
Moderate on a typical day: median AQI 55, with 5 days above AQI 100 out of 366 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 138 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 262 days.
- ✓Cleanest month: April; worst: October.
Frequently asked questions
What was the average AQI in Indianapolis in 2024?▾
EPA's Air Quality System puts Indianapolis's (Indianapolis-Carmel-Anderson, IN) median daily AQI for 2024 at 55, which is Moderate. 5 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 138.
Which month had the worst air quality in Indianapolis in 2024?▾
The cleanest month of 2024 was April (median AQI 48, 0 days above 100) and the worst was October (median 64, 2 days above 100, peak 138).
Was 2024 a good or bad year for Indianapolis's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2024's median of 55 is in line with the area's typical annual median of 56.
Indianapolis month by month in 2024
Indianapolis air quality month by month, 2024 (Indianapolis-Carmel-Anderson, IN, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 54 | 0 | 68 | PM2.5 |
| February | 29 | 57 | 0 | 92 | PM2.5 |
| March | 31 | 54 | 0 | 74 | PM2.5 |
| Aprilcleanest | 30 | 48 | 0 | 74 | O3 |
| May | 31 | 54 | 0 | 80 | O3 |
| June | 30 | 57 | 1 | 108 | O3 |
| July | 31 | 58 | 2 | 116 | PM2.5 |
| August | 31 | 58 | 0 | 100 | PM2.5 |
| September | 30 | 52 | 0 | 90 | O3 |
| Octoberworst | 31 | 64 | 2 | 138 | PM2.5 |
| November | 30 | 56 | 0 | 69 | PM2.5 |
| December | 31 | 54 | 0 | 78 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2024's median of 55 is in line with the area's typical annual median of 56.
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 annual 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.