Air Quality in Napa, California
41
Median AQI (2021)
77
Max AQI (2021)
↓ improving
10-Year Trend
Ozone
Primary Pollutant
108
Good Days (2021)
2
Monitoring Stations
AQI Trend (Median)
Air Quality Days by Category
Annual Summary
| Year | Median AQI | Max AQI | Good Days | Moderate Days | Unhealthy Days | Ozone Days | PM2.5 Days |
|---|---|---|---|---|---|---|---|
| 2021 | 41 | 77 | 108 | 32 | 0 | 74 | 65 |
| 2020 | 39 | 224 | 259 | 91 | 15 | 163 | 199 |
| 2019 | 37 | 119 | 295 | 66 | 2 | 211 | 150 |
| 2018 | 46 | 195 | 210 | 142 | 12 | 99 | 262 |
| 2017 | 53 | 274 | 137 | 214 | 14 | 37 | 326 |
| 2016 | 44 | 90 | 219 | 147 | 0 | 104 | 261 |
| 2015 | 53 | 108 | 158 | 206 | 1 | 104 | 257 |
Recent Daily AQI
| Date | AQI | Category | Primary Pollutant |
|---|---|---|---|
| May 20, 2021 | 2 | Good | CO |
| May 19, 2021 | 39 | Good | Ozone |
| May 18, 2021 | 41 | Good | Ozone |
| May 17, 2021 | 32 | Good | Ozone |
| May 16, 2021 | 38 | Good | Ozone |
| May 15, 2021 | 50 | Good | PM2.5 |
| May 14, 2021 | 41 | Good | PM2.5 |
| May 13, 2021 | 34 | Good | Ozone |
| May 12, 2021 | 40 | Good | Ozone |
| May 11, 2021 | 56 | Moderate | PM2.5 |
| May 10, 2021 | 46 | Good | Ozone |
| May 9, 2021 | 42 | Good | PM2.5 |
| May 8, 2021 | 49 | Good | Ozone |
| May 7, 2021 | 48 | Good | PM2.5 |
| May 6, 2021 | 33 | Good | Ozone |
| May 5, 2021 | 52 | Moderate | PM2.5 |
| May 4, 2021 | 52 | Moderate | PM2.5 |
| May 3, 2021 | 50 | Good | Ozone |
| May 2, 2021 | 43 | Good | PM2.5 |
| May 1, 2021 | 31 | Good | PM2.5 |
| Apr 30, 2021 | 36 | Good | PM2.5 |
| Apr 29, 2021 | 44 | Good | PM2.5 |
| Apr 28, 2021 | 44 | Good | Ozone |
| Apr 27, 2021 | 36 | Good | Ozone |
| Apr 26, 2021 | 39 | Good | Ozone |
| Apr 25, 2021 | 39 | Good | Ozone |
| Apr 24, 2021 | 39 | Good | Ozone |
| Apr 23, 2021 | 57 | Moderate | PM2.5 |
| Apr 22, 2021 | 57 | Moderate | PM2.5 |
| Apr 21, 2021 | 63 | Moderate | PM2.5 |
| Apr 20, 2021 | 49 | Good | PM2.5 |
| Apr 19, 2021 | 52 | Moderate | PM2.5 |
| Apr 18, 2021 | 43 | Good | Ozone |
| Apr 17, 2021 | 46 | Good | PM2.5 |
| Apr 16, 2021 | 52 | Moderate | PM2.5 |
| Apr 15, 2021 | 57 | Moderate | PM2.5 |
| Apr 14, 2021 | 55 | Moderate | PM2.5 |
| Apr 13, 2021 | 55 | Moderate | PM2.5 |
| Apr 12, 2021 | 58 | Moderate | PM2.5 |
| Apr 11, 2021 | 53 | Moderate | PM2.5 |
| Apr 10, 2021 | 39 | Good | Ozone |
| Apr 9, 2021 | 44 | Good | PM2.5 |
| Apr 8, 2021 | 38 | Good | Ozone |
| Apr 7, 2021 | 38 | Good | Ozone |
| Apr 6, 2021 | 48 | Good | PM2.5 |
| Apr 5, 2021 | 36 | Good | Ozone |
| Apr 4, 2021 | 38 | Good | PM2.5 |
| Apr 3, 2021 | 44 | Good | Ozone |
| Apr 2, 2021 | 47 | Good | PM2.5 |
| Apr 1, 2021 | 77 | Moderate | Ozone |
| Mar 31, 2021 | 51 | Moderate | Ozone |
| Mar 30, 2021 | 45 | Good | Ozone |
| Mar 29, 2021 | 39 | Good | Ozone |
| Mar 28, 2021 | 42 | Good | Ozone |
| Mar 27, 2021 | 42 | Good | Ozone |
| Mar 26, 2021 | 39 | Good | Ozone |
| Mar 25, 2021 | 35 | Good | Ozone |
| Mar 24, 2021 | 42 | Good | Ozone |
| Mar 23, 2021 | 42 | Good | Ozone |
| Mar 22, 2021 | 33 | Good | Ozone |
| Mar 21, 2021 | 35 | Good | Ozone |
| Mar 20, 2021 | 38 | Good | Ozone |
| Mar 19, 2021 | 40 | Good | Ozone |
| Mar 18, 2021 | 31 | Good | Ozone |
| Mar 17, 2021 | 38 | Good | Ozone |
| Mar 16, 2021 | 35 | Good | Ozone |
| Mar 15, 2021 | 34 | Good | Ozone |
| Mar 14, 2021 | 39 | Good | Ozone |
| Mar 13, 2021 | 37 | Good | Ozone |
| Mar 12, 2021 | 36 | Good | Ozone |
| Mar 11, 2021 | 39 | Good | Ozone |
| Mar 10, 2021 | 37 | Good | Ozone |
| Mar 9, 2021 | 41 | Good | Ozone |
| Mar 8, 2021 | 43 | Good | Ozone |
| Mar 7, 2021 | 21 | Good | PM2.5 |
| Mar 6, 2021 | 36 | Good | Ozone |
| Mar 5, 2021 | 40 | Good | Ozone |
| Mar 4, 2021 | 46 | Good | PM2.5 |
| Mar 3, 2021 | 49 | Good | PM2.5 |
| Mar 2, 2021 | 51 | Moderate | PM2.5 |
| Mar 1, 2021 | 44 | Good | Ozone |
| Feb 28, 2021 | 40 | Good | Ozone |
| Feb 27, 2021 | 38 | Good | Ozone |
| Feb 26, 2021 | 34 | Good | PM2.5 |
| Feb 25, 2021 | 41 | Good | Ozone |
| Feb 24, 2021 | 42 | Good | Ozone |
| Feb 23, 2021 | 41 | Good | Ozone |
| Feb 22, 2021 | 32 | Good | Ozone |
| Feb 21, 2021 | 32 | Good | Ozone |
| Feb 20, 2021 | 35 | Good | Ozone |
Monitoring Stations
Napa College
Napa Valley College
Frequently Asked Questions
What is the air quality in Napa, California?
Based on EPA data from 2021, Napa has a median Air Quality Index (AQI) of 41, which is classified as "Good." The primary pollutant is Ozone. Over the past 10 years, air quality has been improving.
Is Napa a good place to live for air quality?
Napa has a 10-year average median AQI of 44. In 2021, there were 108 days with "Good" air quality and 0 days with unhealthy conditions. No special precautions are needed for most people.
What pollutants affect Napa the most?
The primary pollutant driving the AQI in Napa is Ozone. This is monitored by 2 active EPA stations in the county. Other pollutants tracked include ozone, PM10, nitrogen dioxide, sulfur dioxide, and carbon monoxide.
How many air quality monitoring stations are in Napa?
There are 2 active EPA monitoring stations in Napa, California. These stations continuously measure pollutant levels and contribute to the daily AQI calculations.