Worst air pollution Napa, today and tomorrow
Today (15 July): Air quality in Napa is fair. PM2.5 and O3 are fair; AQI and NO2 are medium; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (NO2: 43.5/100).
Tomorrow (16 July 2026): Air quality in Napa is fair. PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 PM (NO2: 56.1/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Napa's air quality reflects the Napa Valley's partial topographic enclosure between the Mayacamas and Vaca mountains, with vehicle emissions from CA-29 and the surrounding Napa Valley wine country operations contributing local sources. Summer wildfire smoke from the surrounding Wine Country ranges is a severe and recurring seasonal concern, while the Petaluma Gap Delta breeze provides afternoon ventilation and the valley's enclosed character creates periodic temperature inversion episodes.
Today - 15 July | Pollution peaks at 22:00
AQI:
Medium
43.5/100
PM2.5 (fine particles):
Fair
21.5/100
PM10 (coarse particles):
Good
14.7/100
NO2 (nitrogen dioxide):
Medium
43.5/100
O3 (ozone):
Fair
33.8/100
SO2 (sulfur dioxide):
Good
9.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
12.8/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 22:00
AQI:
Medium
56.1/100
PM2.5 (fine particles):
Fair
32.7/100
PM10 (coarse particles):
Good
18.8/100
NO2 (nitrogen dioxide):
Medium
56.1/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
13.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Fair
22.6/100
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Frequently Asked Questions
Is air quality bad in Napa right now?
On 15 July 2026, overall air quality in Napa is fair. O3 is the main pollutant at 33.8/100. Pollution peaks around 10:00 PM (NO2: 43.5/100).
Will air quality be worse tomorrow in Napa?
On 16 July 2026, air quality conditions in Napa will be similar to today, with O3 forecast at fair at 32.8/100. Pollution peaks around 10:00 PM (NO2: 56.1/100).
When is air pollution at its worst in Napa?
Air quality across Napa rises and falls with the seasons. In short, the rainy winter months generally bring the cleanest air, as storms clear traffic and woodsmoke pollution, whereas summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Napa based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app