Louisville Air Quality in July
Across 2019–2025, Louisville's July air quality had a median AQI of 57 (Moderate) over 217 monitored days in the Louisville/Jefferson County, KY-IN area. 9.3% of July days (20 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 54.8% of days. The cleanest July on record here was 2022 (median AQI 54, 1 day above 100) and the worst was 2023 (median 58, 5 days above 100, peak AQI 122).
- Good: 29.0%
- Moderate: 61.8%
- Unhealthy for Sensitive Groups: 8.8%
- Unhealthy or worse: 0.5%
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How is the air in Louisville in July?
Moderate on a typical day: median AQI 57 across 2019–2025, with 9.3% of July days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓29.0% of July days were Good (AQI 0–50), 61.8% Moderate (51–100).
- ✓20 days of 217 reached AQI 101+; the July peak was 153.
- ✓Best July: 2022; worst July: 2023.
Frequently asked questions
What is the air quality like in Louisville in July?▾
Across 2019–2025, the median daily AQI in Louisville in July was 57 (Moderate). 29.0% of days were Good, 61.8% Moderate, and 9.3% 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 Louisville?▾
A typical July day in Louisville is Moderate (median AQI 57): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 11 of July days (9.3%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Louisville's July air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 54.8% of July days in Louisville. The highest July AQI recorded in 2019–2025 was 153 (Unhealthy), in 2023.
Louisville July air quality, year by year
Louisville July air quality by year (Louisville/Jefferson County, KY-IN, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 57 | 2 | 122 | PM2.5 |
| 2020 | 31 | 54 | 4 | 143 | O3 |
| 2021 | 31 | 65 | 3 | 143 | PM2.5 |
| 2022cleanest | 31 | 54 | 1 | 101 | O3 |
| 2023worst | 31 | 58 | 5 | 122 | PM2.5 |
| 2024 | 31 | 59 | 2 | 136 | O3 |
| 2025 | 31 | 56 | 3 | 153 | PM2.5 |
What July air means in Louisville
A typical July day in Louisville is Moderate (median AQI 57): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 11 of July days (9.3%) 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 57 is in line with Louisville's whole-year median of 54, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Louisville runs above the national July norm; 9.3% of its July days topped AQI 100 versus 3.6% nationally (above average).
July is part of Louisville's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Louisville
The latest EPA AirNow observation puts Louisville's AQI at 38 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Louisville air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Louisville/Jefferson County, KY-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.