Pima, Arizona Air Quality
Pima County, Arizona (AZ)
↑ 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 | 54 | 84 | 147 | 123 | 235 | 7 | Ozone |
| 2022 | 53 | 81 | 142 | 147 | 205 | 13 | Ozone |
| 2021 | 56 | 85 | 313 | 93 | 258 | 14 | Ozone |
| 2020 | 55 | 77 | 277 | 124 | 229 | 13 | Ozone |
| 2019 | 49 | 71 | 103 | 207 | 156 | 2 | Ozone |
| 2018 | 52 | 84 | 129 | 164 | 190 | 11 | Ozone |
| 2017 | 54 | 80 | 122 | 121 | 237 | 7 | Ozone |
| 2016 | 50 | 74 | 119 | 191 | 171 | 4 | Ozone |
| 2015 | 46 | 71 | 101 | 236 | 128 | 1 | Ozone |
| 2014 | 50 | 74 | 129 | 197 | 165 | 3 | Ozone |
What This Means for Pima County Residents
Pima, Arizona has received an Air Quality Grade of C (50/100) based on a decade of EPA monitoring data. The current median AQI of 54 falls in the "Moderate" range.
Concerning trends show air quality has been declining, with the median AQI rising by 4 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 10 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.