Rosemont Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in Rosemont is moderate. AQI and PM10 are moderate; PM2.5 and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (PM10: 43.4/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in Rosemont is moderate. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 AM (PM10: 40.8/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 43.4/100 |
| PM2.5 (fine particles) | Fair | 28.6/100 |
| PM10 (coarse particles) | Moderate | 43.4/100 |
| NO2 (nitrogen dioxide) | Good | 7.8/100 |
| O3 (ozone) | Fair | 26.4/100 |
| SO2 (sulfur dioxide) | Good | 1.6/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 4.4/100 |
| PM1 (ultrafine particles) | Good | 3.9/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 40.8/100 |
| PM2.5 (fine particles) | Fair | 36.6/100 |
| PM10 (coarse particles) | Moderate | 40.8/100 |
| NO2 (nitrogen dioxide) | Fair | 23.7/100 |
| O3 (ozone) | Fair | 25.5/100 |
| SO2 (sulfur dioxide) | Good | 1.8/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 3.7/100 |
| PM1 (ultrafine particles) | Good | 5.8/100 |
Local Environmental Conditions
With buildings covering much of the area around the center of Rosemont, traffic and other urban emissions are the biggest local influence on air quality. Parks and street trees provide a modest buffer against traffic pollution. Pollution carried in from the wider region can also raise levels at times. Levels are generally highest right next to busy roads and drop off quickly with distance.
The cooler months, December to February, see more fine particles, as home heating and traffic add emissions while frequent calm, cold mornings around 9°C keep pollution near the ground. In the warmer months, summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in Rosemont right now?
On 6 October 2026, overall air quality in Rosemont is moderate. AQI is the main air quality indicator at 43.4/100. Pollution peaks around 12:00 PM (PM10: 43.4/100).
Will air quality be worse tomorrow in Rosemont?
On 7 October 2026, air quality conditions in Rosemont will be similar to today, with AQI forecast at moderate at 40.8/100. Pollution peaks around 8:00 AM (PM10: 40.8/100).
When is air pollution at its worst in Rosemont?
The cooler months, December to February, see more fine particles, as home heating and traffic add emissions while frequent calm, cold mornings around 9°C keep pollution near the ground. In the warmer months, summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C.
Are air quality levels in Rosemont 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. |