Baltimore Air Quality in Spring
Across 2019–2025, Baltimore's spring (March–May) air quality had a median AQI of 46 (Good) over 643 monitored days in the Baltimore-Columbia-Towson, MD area. 1.1% of spring days (7 of 643) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 75.6% of days. The cleanest spring on record here was 2020 (median AQI 44, 0 days above 100) and the worst was 2021 (median 48, 3 days above 100, peak AQI 122).
- Good: 67.3%
- Moderate: 31.6%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.0%
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How is the air in Baltimore in spring?
Good on a typical day: median AQI 46 across 2019–2025, with 1.1% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓67.3% of spring days were Good (AQI 0–50), 31.6% Moderate (51–100).
- ✓7 days of 643 reached AQI 101+; the spring peak was 122.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Baltimore in spring?▾
Across 2019–2025, the median daily AQI in Baltimore in spring was 46 (Good). 67.3% of days were Good, 31.6% Moderate, and 1.1% reached Unhealthy for Sensitive Groups or worse, based on 643 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Baltimore?▾
A typical spring day in Baltimore sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 91 of spring days (1.1%) reached AQI 101+ in 2019–2025.
Which pollutant causes Baltimore's spring air quality problems?▾
Ground-level ozone set the daily AQI on 75.6% of spring days in Baltimore. The highest spring AQI recorded in 2019–2025 was 122 (Unhealthy for Sensitive Groups), in 2021.
Baltimore spring air quality, year by year
Baltimore spring 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 | 92 | 50 | 0 | 80 | O3 |
| 2020cleanest | 91 | 44 | 0 | 64 | O3 |
| 2021worst | 92 | 48 | 3 | 122 | O3 |
| 2022 | 92 | 45 | 0 | 97 | O3 |
| 2023 | 92 | 49 | 2 | 112 | O3 |
| 2024 | 92 | 45 | 2 | 115 | O3 |
| 2025 | 92 | 44 | 0 | 90 | O3 |
What spring air means in Baltimore
A typical spring day in Baltimore sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 91 of spring days (1.1%) reached AQI 101+ in 2019–2025.
Spring's median AQI of 46 is in line with Baltimore's whole-year median of 49, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Baltimore runs in line with the national Spring norm; 1.1% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, March is the cleanest month (median AQI 45, 0.0% of days above 100) and May the worst (median 48, 2.8% above 100).
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 season 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.