Baltimore, Maryland Air Quality
Baltimore County, Maryland (MD)
→ Stableover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 45 | 71 | 205 | 228 | 124 | 13 | Ozone |
| 2022 | 45 | 64 | 122 | 238 | 126 | 1 | Ozone |
| 2021 | 47 | 71 | 140 | 207 | 148 | 10 | Ozone |
| 2020 | 43 | 59 | 105 | 257 | 106 | 2 | Ozone |
| 2019 | 46 | 71 | 150 | 232 | 124 | 9 | Ozone |
| 2018 | 46 | 69 | 115 | 218 | 142 | 5 | PM2.5 |
| 2017 | 43 | 69 | 166 | 262 | 91 | 12 | Ozone |
| 2016 | 48 | 87 | 204 | 200 | 144 | 22 | Ozone |
| 2015 | 43 | 77 | 143 | 242 | 110 | 13 | Ozone |
| 2014 | 42 | 69 | 136 | 257 | 105 | 3 | Ozone |
What This Means for Baltimore County Residents
Baltimore, Maryland has received an Air Quality Grade of C (59/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 45 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 7 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
Related Cities in Maryland
Frequently Asked Questions
Baltimore, Maryland has a current median AQI of 45, which falls in the "Good" range. The area has received an Air Quality Grade of C (59/100) based on 10 years of EPA monitoring data.
Air quality in Baltimore, Maryland is stable over the past decade. The median AQI has changed by +3 points from 2014 to 2023.
Baltimore, Maryland averages 7 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting Baltimore, Maryland is Ground-Level Ozone. This is the dominant contributor to elevated AQI readings in the Baltimore County area.
Baltimore, Maryland averages 7 unhealthy air days per year. Asthma patients should monitor daily AQI readings and limit outdoor activity when AQI exceeds 100. The primary pollutant is Ground-Level Ozone, which is a known asthma trigger.
With a median AQI of 45 (Good), outdoor exercise in Baltimore, Maryland is generally safe year-round. Baltimore, Maryland averages 7 days per year when athletes should move workouts indoors.