Sentinel Dome, Yosemite Valley Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in Sentinel Dome is moderate. AQI, PM2.5, and PM10 are moderate; O3 is fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 43.3/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in Sentinel Dome is moderate. NO2 increases to fair; O3 increases to moderate; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 49.2/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 43.3/100 |
| PM2.5 (fine particles) | Moderate | 40.8/100 |
| PM10 (coarse particles) | Moderate | 43.3/100 |
| NO2 (nitrogen dioxide) | Good | 12.0/100 |
| O3 (ozone) | Fair | 39.0/100 |
| SO2 (sulfur dioxide) | Good | 1.8/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 1.8/100 |
| PM1 (ultrafine particles) | Good | 8.2/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 49.2/100 |
| PM2.5 (fine particles) | Moderate | 45.1/100 |
| PM10 (coarse particles) | Moderate | 43.8/100 |
| NO2 (nitrogen dioxide) | Fair | 22.0/100 |
| O3 (ozone) | Moderate | 49.2/100 |
| SO2 (sulfur dioxide) | Good | 1.7/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 2.8/100 |
| PM1 (ultrafine particles) | Good | 11.8/100 |
Local Environmental Conditions
Around this site in Yosemite Valley, traffic is light and there are few concentrated sources of air pollution. Woodland in the area offers some natural filtering of particles from traffic. Light average winds mean local emissions are not always carried away quickly. On some days, pollution drifting in from farther away outweighs local sources.
From November to March, temperatures near 2°C, with winds of around 10 km/h, let smoke and particles from wood burning and traffic build up, especially on cold, still mornings. In the warmer months, ozone is the main concern from July to August, when sunny days averaging 24°C turn traffic and other emissions into ozone by mid-afternoon.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in Sentinel Dome right now?
On 6 October 2026, overall air quality in Sentinel Dome is moderate. AQI is the main air quality indicator at 43.3/100. Pollution peaks around 10:00 AM (PM10: 43.3/100).
Will air quality be worse tomorrow in Sentinel Dome?
On 7 October 2026, air quality conditions in Sentinel Dome will be similar to today, with AQI forecast at moderate at 49.2/100. Pollution peaks around 4:00 PM (O3: 49.2/100).
When is air pollution at its worst in Sentinel Dome?
From November to March, temperatures near 2°C, with winds of around 10 km/h, let smoke and particles from wood burning and traffic build up, especially on cold, still mornings. In the warmer months, ozone is the main concern from July to August, when sunny days averaging 24°C turn traffic and other emissions into ozone by mid-afternoon.
Are air quality levels in Sentinel Dome 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |