Worst air pollution Harlingen, today and tomorrow
Today (16 July): Air quality in Harlingen is very poor. AQI, PM2.5, and PM10 are very poor; O3 and PM1 are fair; NO2, SO2, CO, and HCHO are good. Pollution peaks around 12:00 AM (PM10: 100/100).
Tomorrow (17 July 2026): Air quality in Harlingen is very poor. All pollutants stay as today. Pollution peaks around 12:00 AM (PM10: 100/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
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 - 16 July | Pollution peaks at 00:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Very poor
93.9/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.8/100
O3 (ozone):
Fair
29.9/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Fair
28.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Very poor
90.6/100
PM10 (coarse particles):
Very poor
100/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
28.2/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.8/100
PM1 (ultrafine particles):
Fair
27.3/100
Pollen forecast in Harlingen
View pollen forecastFrequently Asked Questions
Is air quality bad in Harlingen right now?
On 16 July 2026, overall air quality in Harlingen is very poor. AQI is the main air quality indicator at 100/100. Pollution peaks around 12:00 AM (PM10: 100/100).
Will air quality be worse tomorrow in Harlingen?
On 17 July 2026, air quality conditions in Harlingen will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 12:00 AM (PM10: 100/100).
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.
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: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app