San Nicolás de los Garza Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (14 October): Air quality in San Nicolás de los Garza is very poor. AQI, PM2.5, and PM10 are very poor; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (PM2.5: 100/100).
Air Quality Tomorrow
Tomorrow (15 October 2026): Air quality in San Nicolás de los Garza is very poor. All pollutants stay as today. Pollution peaks around 5:00 AM (PM2.5: 100/100).
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Air Quality
Today - 14 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Very poor | 100/100 |
| PM2.5 (fine particles) | Very poor | 98.2/100 |
| PM10 (coarse particles) | Very poor | 100/100 |
| NO2 (nitrogen dioxide) | Good | 0.5/100 |
| O3 (ozone) | Good | 12.7/100 |
| SO2 (sulfur dioxide) | Good | 0.1/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.7/100 |
| PM1 (ultrafine particles) | Good | 16.0/100 |
Tomorrow - 15 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Very poor | 100/100 |
| PM2.5 (fine particles) | Very poor | 96.7/100 |
| PM10 (coarse particles) | Very poor | 100/100 |
| NO2 (nitrogen dioxide) | Good | 0.9/100 |
| O3 (ozone) | Good | 12.6/100 |
| SO2 (sulfur dioxide) | Good | 0.2/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 17.1/100 |
Local Environmental Conditions
Around the heart of San Nicolás de los Garza, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Lying in a basin at around 490 m, the area is prone to temperature inversions that hold pollutants near the ground when winds drop. Local sources include steelmaking. Pollution carried in from the wider region can also raise levels at times.
Ozone is the main concern from March to October, when sunny days averaging 30°C turn traffic and other emissions into ozone by mid-afternoon. Later, even in the mild winter months, December to February, at around 14°C, calm nights let traffic pollution settle in the basin. Breezy weather in June, with winds near 15 km/h, tends to sweep pollution away.
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Frequently Asked Questions About Air Quality in Nuevo León
Is air quality bad in San Nicolás de los Garza right now?
On 14 October 2026, overall air quality in San Nicolás de los Garza is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 12:00 AM (PM2.5: 100/100).
Will air quality be worse tomorrow in San Nicolás de los Garza?
On 15 October 2026, air quality conditions in San Nicolás de los Garza will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 5:00 AM (PM2.5: 100/100).
When is air pollution at its worst in San Nicolás de los Garza?
Ozone is the main concern from March to October, when sunny days averaging 30°C turn traffic and other emissions into ozone by mid-afternoon. Later, even in the mild winter months, December to February, at around 14°C, calm nights let traffic pollution settle in the basin. Breezy weather in June, with winds near 15 km/h, tends to sweep pollution away.
Are air quality levels in San Nicolás de los Garza 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. |