Worst air pollution Sterling Vineyards - Napa, today and tomorrow
Today (15 July): Air quality in Sterling Vineyards is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 33.8/100).
Tomorrow (16 July 2026): Air quality in Sterling Vineyards is fair. All pollutants stay as today. Pollution peaks around 12:00 PM (O3: 32.8/100). 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 Sterling Vineyards air quality reflects the Napa Valley's partial topographic enclosure, with vehicle traffic on CA-29 and the concentrated wine tourism 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 vineyard setting maintains moderate to good conditions during non-wildfire periods throughout most of the year.
Today - 15 July | Pollution peaks at 10:00
AQI:
Fair
33.8/100
PM2.5 (fine particles):
Good
9.3/100
PM10 (coarse particles):
Good
6.3/100
NO2 (nitrogen dioxide):
Good
4.2/100
O3 (ozone):
Fair
33.8/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
5.5/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 12:00
AQI:
Fair
32.8/100
PM2.5 (fine particles):
Good
14.8/100
PM10 (coarse particles):
Good
8.0/100
NO2 (nitrogen dioxide):
Good
7.1/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
10.1/100
Other Landmarks in Napa
Sports venues in Napa
Frequently Asked Questions
Is air quality bad in Sterling Vineyards right now?
On 15 July 2026, overall air quality in Sterling Vineyards is fair. AQI is the main air quality indicator at 33.8/100. Pollution peaks around 10:00 AM (O3: 33.8/100).
Will air quality be worse tomorrow in Sterling Vineyards?
On 16 July 2026, air quality conditions in Sterling Vineyards will be similar to today, with AQI forecast at fair at 32.8/100. Pollution peaks around 12:00 PM (O3: 32.8/100).
When is air pollution at its worst in Sterling Vineyards?
Conditions at Sterling Vineyards vary noticeably across the seasons. Typically, winter storms periodically reset air quality, keeping the cleanest stretch to the rainy months, while summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Dry summer conditions with virtually no rain mean pollution and smoke can linger for extended stretches once they arrive.
Are air quality levels in Sterling Vineyards 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