Adams, Colorado Air Quality
Adams County, Colorado (CO)
↑ Worseningover 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 in this area has been declining over the past 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 | 51 | 71 | 174 | 179 | 181 | 5 | Ozone |
| 2022 | 51 | 84 | 126 | 180 | 171 | 14 | Ozone |
| 2021 | 49 | 93 | 151 | 188 | 154 | 23 | Ozone |
| 2020 | 49 | 74 | 151 | 192 | 162 | 12 | Ozone |
| 2019 | 50 | 67 | 132 | 183 | 181 | 1 | PM2.5 |
| 2018 | 54 | 74 | 130 | 138 | 224 | 3 | PM2.5 |
| 2017 | 52 | 73 | 132 | 160 | 203 | 2 | PM2.5 |
| 2016 | 46 | 65 | 105 | 236 | 129 | 1 | Ozone |
| 2015 | 45 | 64 | 115 | 266 | 96 | 3 | Ozone |
| 2014 | 48 | 71 | 124 | 222 | 138 | 5 | Ozone |
What This Means for Adams County Residents
Adams, Colorado has received an Air Quality Grade of C (53/100) based on a decade of EPA monitoring data. The current median AQI of 51 falls in the "Moderate" range.
Concerning trends show air quality has been declining, with the median AQI rising by 3 points over the monitoring period. This could be driven by increased development, wildfire smoke, or industrial activity.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 11 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.