Worst air pollution Harlingen, today and tomorrow
Today (9 August): Air quality in Harlingen is very poor. AQI and PM10 are very poor; PM2.5 is poor; O3 is fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (PM10: 99.0/100).
Tomorrow (10 August 2026): Air quality in Harlingen is very poor. All pollutants stay as today. Pollution peaks around 11:00 PM (PM10: 90.9/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Harlingen's air quality reflects the lower Rio Grande Valley's border city character, with vehicle emissions from US-83 and the surrounding citrus farming and maquiladora operations contributing local sources. Gulf of Mexico southeasterly breezes provide reliable warm-season ventilation, while agricultural burning from surrounding operations and cross-border industrial emissions from Matamoros contribute seasonal background air quality influences.
Today - 9 August | Pollution peaks at 04:00
AQI:
Very poor
99.0/100
PM2.5 (fine particles):
Poor
62.8/100
PM10 (coarse particles):
Very poor
99.0/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
29.0/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
14.2/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Very poor
90.9/100
PM2.5 (fine particles):
Poor
60.9/100
PM10 (coarse particles):
Very poor
90.9/100
NO2 (nitrogen dioxide):
Good
0.7/100
O3 (ozone):
Fair
30.6/100
SO2 (sulfur dioxide):
Good
16.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
19.1/100
Pollen forecast in Harlingen
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Harlingen
Frequently Asked Questions
Is air quality bad in Harlingen right now?
On 9 August 2026, overall air quality in Harlingen is very poor. AQI is the main air quality indicator at 99.0/100. Pollution peaks around 4:00 AM (PM10: 99.0/100).
Will air quality be worse tomorrow in Harlingen?
On 10 August 2026, air quality conditions in Harlingen will be similar to today, with AQI forecast at very poor at 90.9/100. Pollution peaks around 11:00 PM (PM10: 90.9/100).
When is air pollution at its worst in Harlingen?
Harlingen's air quality has a clear seasonal rhythm — spring and autumn generally bring more moderate, cleaner conditions between the extremes of summer and winter cedar season, whereas long, hot summers bring the highest ozone risk, especially across the major urban corridors. Gulf Coast humidity and inland heat can each add their own seasonal pollution patterns.
Are air quality levels in Harlingen 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.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Get the full experience in the Airmine app.