Baltimore Air Quality in July
Across 2019–2025, Baltimore's July air quality had a median AQI of 61 (Moderate) over 217 monitored days in the Baltimore-Columbia-Towson, MD area. 10.1% of July days (22 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 68.7% of days. The cleanest July on record here was 2025 (median AQI 54, 1 day above 100) and the worst was 2023 (median 67, 6 days above 100, peak AQI 126).
- Good: 22.6%
- Moderate: 67.3%
- Unhealthy for Sensitive Groups: 10.1%
- Unhealthy or worse: 0.0%
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How is the air in Baltimore in July?
Moderate on a typical day: median AQI 61 across 2019–2025, with 10.1% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓22.6% of July days were Good (AQI 0–50), 67.3% Moderate (51–100).
- ✓22 days of 217 reached AQI 101+; the July peak was 136.
- ✓Best July: 2025; worst July: 2023.
Frequently asked questions
What is the air quality like in Baltimore in July?▾
Across 2019–2025, the median daily AQI in Baltimore in July was 61 (Moderate). 22.6% of days were Good, 67.3% Moderate, and 10.1% 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 Baltimore?▾
A typical July day in Baltimore 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 10 of July days (10.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Baltimore's July air quality problems?▾
Ground-level ozone set the daily AQI on 68.7% of July days in Baltimore. The highest July AQI recorded in 2019–2025 was 136 (Unhealthy for Sensitive Groups), in 2023.
Baltimore July air quality, year by year
Baltimore July air quality by year (Baltimore-Columbia-Towson, MD, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 67 | 5 | 129 | O3 |
| 2020 | 31 | 61 | 2 | 119 | O3 |
| 2021 | 31 | 63 | 4 | 126 | PM2.5 |
| 2022 | 31 | 61 | 1 | 108 | O3 |
| 2023worst | 31 | 67 | 6 | 126 | O3 |
| 2024 | 31 | 64 | 3 | 108 | O3 |
| 2025cleanest | 31 | 54 | 1 | 136 | O3 |
What July air means in Baltimore
A typical July day in Baltimore 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 10 of July days (10.1%) 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 Baltimore's whole-year median of 49, 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 Baltimore runs above the national July norm; 10.1% of its July days topped AQI 100 versus 3.6% nationally (above average).
July is part of Baltimore's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Baltimore
The latest EPA AirNow observation puts Baltimore's AQI at 43 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Baltimore air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Baltimore-Columbia-Towson, MD), 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.