Fallbrook Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in Fallbrook is moderate. AQI, PM2.5, and PM10 are moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 58.1/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in Fallbrook is moderate. All pollutants stay as today. Pollution peaks around 10:00 AM (PM10: 55.8/100).
Explore Forecasts
Pollen & Mold
Air Quality in Other Cities
Pollen in Other Cities
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 58.1/100 |
| PM2.5 (fine particles) | Moderate | 42.5/100 |
| PM10 (coarse particles) | Moderate | 58.1/100 |
| NO2 (nitrogen dioxide) | Good | 2.8/100 |
| O3 (ozone) | Good | 17.9/100 |
| SO2 (sulfur dioxide) | Good | 1.3/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.9/100 |
| PM1 (ultrafine particles) | Good | 5.3/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 55.8/100 |
| PM2.5 (fine particles) | Moderate | 42.3/100 |
| PM10 (coarse particles) | Moderate | 55.8/100 |
| NO2 (nitrogen dioxide) | Good | 2.9/100 |
| O3 (ozone) | Good | 16.7/100 |
| SO2 (sulfur dioxide) | Good | 1.7/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 5.9/100 |
Local Environmental Conditions
Around this site in Fallbrook, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Parks and street trees provide a modest buffer against traffic pollution. Winds are often light, which allows pollutants to linger close to where they are produced. Pollution carried in from the wider region can also raise levels at times.
Particle levels tend to be highest from January to March, when home heating and traffic add more emissions and cold, calm spells at around 10°C can leave a light winter haze over the city. From June to September, strong sunshine and temperatures around 26°C drive ozone formation, with levels peaking in the afternoon.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Frequently Asked Questions About Air Quality in California
Is air quality bad in Fallbrook right now?
On 6 October 2026, overall air quality in Fallbrook is moderate. AQI is the main air quality indicator at 58.1/100. Pollution peaks around 10:00 AM (PM10: 58.1/100).
Will air quality be worse tomorrow in Fallbrook?
On 7 October 2026, air quality conditions in Fallbrook will be similar to today, with AQI forecast at moderate at 55.8/100. Pollution peaks around 10:00 AM (PM10: 55.8/100).
When is air pollution at its worst in Fallbrook?
Particle levels tend to be highest from January to March, when home heating and traffic add more emissions and cold, calm spells at around 10°C can leave a light winter haze over the city. From June to September, strong sunshine and temperatures around 26°C drive ozone formation, with levels peaking in the afternoon.
Are air quality levels in Fallbrook 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. |