Placer, California Air Quality
Placer County, California (CA)
↑ 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 | 52 | 80 | 143 | 164 | 193 | 8 | Ozone |
| 2022 | 54 | 90 | 442 | 156 | 185 | 24 | Ozone |
| 2021 | 58 | 115 | 692 | 130 | 187 | 48 | Ozone |
| 2020 | 57 | 108 | 247 | 130 | 195 | 41 | Ozone |
| 2019 | 49 | 77 | 136 | 198 | 158 | 9 | Ozone |
| 2018 | 46 | 84 | 248 | 213 | 127 | 25 | Ozone |
| 2017 | 46 | 77 | 156 | 211 | 145 | 9 | Ozone |
| 2016 | 50 | 80 | 166 | 187 | 159 | 20 | PM2.5 |
| 2015 | 51 | 77 | 189 | 179 | 177 | 9 | PM2.5 |
| 2014 | 57 | 97 | 265 | 116 | 221 | 28 | Ozone |
What This Means for Placer County Residents
Placer, California has received an Air Quality Grade of D (45/100) based on a decade of EPA monitoring data. The current median AQI of 52 falls in the "Moderate" range.
Concerning trends show air quality has been declining, with the median AQI rising by 5 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 26 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.