Calvert, Maryland Air Quality
Calvert County, Maryland (MD)
↓ Improvingover 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). This area has seen measurable air quality improvement over the decade.
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 | 42 | 54 | 101 | 206 | 31 | 1 | Ozone |
| 2022 | 39 | 47 | 74 | 225 | 14 | 0 | Ozone |
| 2021 | 39 | 49 | 105 | 205 | 17 | 1 | Ozone |
| 2020 | 35 | 44 | 67 | 235 | 3 | 0 | Ozone |
| 2019 | 39 | 49 | 71 | 214 | 18 | 0 | Ozone |
| 2018 | 39 | 58 | 147 | 209 | 33 | 1 | Ozone |
| 2017 | 43 | 61 | 108 | 199 | 40 | 1 | Ozone |
| 2016 | 42 | 67 | 115 | 165 | 46 | 3 | Ozone |
| 2015 | 44 | 71 | 93 | 145 | 61 | 0 | Ozone |
| 2014 | 44 | 71 | 105 | 156 | 54 | 3 | Ozone |
What This Means for Calvert County Residents
Calvert, Maryland has received an Air Quality Grade of B (71/100) based on a decade of EPA monitoring data. The current median AQI of 42 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 2 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 0 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.