Nevada, California Air Quality
Nevada County, California (CA)
→ 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 | 42 | 55 | 97 | 282 | 81 | 0 | PM2.5 |
| 2022 | 50 | 87 | 293 | 185 | 161 | 19 | Ozone |
| 2021 | 50 | 115 | 326 | 183 | 129 | 53 | Ozone |
| 2020 | 46 | 91 | 277 | 223 | 111 | 32 | PM2.5 |
| 2019 | 45 | 71 | 122 | 251 | 105 | 5 | Ozone |
| 2018 | 45 | 87 | 218 | 231 | 104 | 28 | Ozone |
| 2017 | 49 | 133 | 185 | 194 | 90 | 81 | Ozone |
| 2016 | 45 | 101 | 179 | 232 | 89 | 45 | Ozone |
| 2015 | 48 | 93 | 166 | 213 | 120 | 31 | Ozone |
| 2014 | 47 | 100 | 168 | 211 | 120 | 34 | Ozone |
What This Means for Nevada County Residents
Nevada, California has received an Air Quality Grade of C (53/100) based on a decade of EPA monitoring data. The current median AQI of 42 falls in the "Good" range.
The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 22 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.