Indianapolis Air Quality in July
Across 2019–2025, Indianapolis's July air quality had a median AQI of 61 (Moderate) over 217 monitored days in the Indianapolis-Carmel-Anderson, IN area. 6.0% of July days (13 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 65.9% of days. The cleanest July on record here was 2022 (median AQI 57, 0 days above 100) and the worst was 2023 (median 65, 5 days above 100, peak AQI 134).
- Good: 21.2%
- Moderate: 72.8%
- Unhealthy for Sensitive Groups: 5.1%
- Unhealthy or worse: 0.9%
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How is the air in Indianapolis in July?
Moderate on a typical day: median AQI 61 across 2019–2025, with 6.0% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓21.2% of July days were Good (AQI 0–50), 72.8% Moderate (51–100).
- ✓13 days of 217 reached AQI 101+; the July peak was 170.
- ✓Best July: 2022; worst July: 2023.
Frequently asked questions
What is the air quality like in Indianapolis in July?▾
Across 2019–2025, the median daily AQI in Indianapolis in July was 61 (Moderate). 21.2% of days were Good, 72.8% Moderate, and 6.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Indianapolis?▾
A typical July day in Indianapolis is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 17 of July days (6.0%) 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 July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 65.9% of July days in Indianapolis. The highest July AQI recorded in 2019–2025 was 170 (Unhealthy), in 2023.
Indianapolis July air quality, year by year
Indianapolis July 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 | 66 | 1 | 108 | PM2.5 |
| 2020 | 31 | 57 | 2 | 108 | O3 |
| 2021 | 31 | 68 | 1 | 112 | PM2.5 |
| 2022cleanest | 31 | 57 | 0 | 96 | PM2.5 |
| 2023worst | 31 | 65 | 5 | 134 | PM2.5 |
| 2024 | 31 | 58 | 2 | 116 | PM2.5 |
| 2025 | 31 | 58 | 2 | 170 | PM2.5 |
What July air means in Indianapolis
A typical July day in Indianapolis is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 17 of July days (6.0%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
July's median AQI of 61 is above Indianapolis's whole-year median of 56, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Indianapolis runs above the national July norm; 6.0% of its July days topped AQI 100 versus 3.6% nationally (above average).
July is part of Indianapolis's summer season (June, July, August); the summer 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 47 (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.