Air quality
Air quality in San Fernando, Tamaulipas today
Updated
Good (US AQI 43) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Sun, Oct 25, 2:00 pm (20:00 UTC).
Live AQI, PM2.5, PM10 and ozone for San Fernando, Tamaulipas, Mexico, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 43 Good
- PM2.5
- 9.9 µg/m³ 0.7× WHO 24-h guideline
- PM10
- 16 µg/m³
- Ozone
- 101 µg/m³
- Dominant pollutant
- PM2.5 sub-index 43
- Best hour today
- 2:00 pm AQI 43
- European AQI
- 41
Air quality in San Fernando, Tamaulipas right now
Right now the modelled US Air Quality Index for San Fernando, Tamaulipas, Mexico is 43, which falls in the "Good" band (up to 50). Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
The index is driven mainly by PM2.5, whose own sub-index is 43. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 9.9 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 16 µg/m³ against a guideline of 45; ozone is 101 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 0.1 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 4.8, carbon monoxide 117 µg/m³.
NASA FIRMS shows 11 fire hotspots within 300 km in the last day (nearest about 104 km), but particle levels are not elevated enough to point to smoke right now.
San Fernando, Tamaulipas AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 43 around Sun 2:00 pm to 52 around Mon 6:00 am, from "Good" at best to "Moderate" at worst.
The following day looks similar, averaging about 47.
| Local time (America/Monterrey) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 2:00 pm | 43 | Good | 9.9 | 16 | 101 |
| Sun 5:00 pm | 47 | Good | 9.2 | 14 | 95 |
| Sun 8:00 pm | 49 | Good | 9.4 | 14 | 83 |
| Sun 11:00 pm | 50 | Good | 10 | 16 | 71 |
| Mon 2:00 am | 51 | Moderate | 9.8 | 15 | 64 |
| Mon 5:00 am | 51 | Moderate | 10.5 | 16 | 61 |
| Mon 8:00 am | 52 | Moderate | 10.1 | 15 | 74 |
| Mon 11:00 am | 52 | Moderate | 7.9 | 13 | 93 |
| Mon 2:00 pm | 51 | Moderate | 7.6 | 12 | 96 |
| Mon 5:00 pm | 51 | Moderate | 8.1 | 13 | 85 |
| Mon 8:00 pm | 50 | Good | 8.1 | 13 | 66 |
| Mon 11:00 pm | 50 | Good | 7.7 | 11 | 56 |
| Tue 2:00 am | 48 | Good | 7.5 | 10 | 42 |
| Tue 5:00 am | 46 | Good | 7.3 | 10 | 24 |
| Tue 8:00 am | 44 | Good | 7.5 | 10 | 55 |
| Tue 11:00 am | 42 | Good | 3.1 | 5 | 78 |
| Tue 2:00 pm | 38 | Good | 2.1 | 3 | 76 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in San Fernando, Tamaulipas today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 2:00 pm (AQI 43, Good) and the worst around 8:00 pm (AQI 49). The difference across the day is small, so timing matters little.
San Fernando, Tamaulipas vs the rest of Mexico
Across 100 Mexico cities we track, the average US AQI right now is 45 (Good). San Fernando, Tamaulipas at 43 is about average.
It ranks 44 of 100 from cleanest to most polluted; the cleanest is Hermosillo (22) and the most polluted Jiutepec (87).
For context, the median across 3,909 cities worldwide is 56.
Air quality in cities near San Fernando, Tamaulipas
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Heroica Matamoros | 132 km | 51 | Moderate | 10.8 |
| Brownsville | 134 km | 51 | Moderate | 10.8 |
| Reynosa | 138 km | 46 | Good | 9.5 |
| San Juan, TX | 149 km | 46 | Good | 9.5 |
| McAllen | 151 km | 46 | Good | 9.5 |
| Mission | 153 km | 46 | Good | 9.5 |
| Harlingen | 156 km | 51 | Moderate | 10.8 |
| Ciudad Victoria | 159 km | 33 | Good | 3.9 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of San Fernando, Tamaulipas, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
With the AQI at 43, there is no need for sensitive groups to change plans. People with asthma should still carry their reliever inhaler as usual.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for San Fernando
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.