Worst air pollution Letterkenny, today and tomorrow
Today (16 July): Air quality in Letterkenny is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 28.9/100).
Tomorrow (17 July 2026): Air quality in Letterkenny is fair. All pollutants stay as today. Pollution peaks around 12:00 AM (O3: 29.0/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Letterkenny's air quality benefits from its remote northwestern Donegal highland position, with consistent Atlantic westerlies providing outstanding maritime ventilation. Vehicle traffic on the N13 and N14 is the primary local source.
Today - 16 July | Pollution peaks at 23:00
AQI:
Fair
28.9/100
PM2.5 (fine particles):
Fair
24.1/100
PM10 (coarse particles):
Good
9.1/100
NO2 (nitrogen dioxide):
Good
1.3/100
O3 (ozone):
Fair
28.9/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
18.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 00:00
AQI:
Fair
29.0/100
PM2.5 (fine particles):
Fair
24.2/100
PM10 (coarse particles):
Good
9.4/100
NO2 (nitrogen dioxide):
Good
3.4/100
O3 (ozone):
Fair
29.0/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.0/100
PM1 (ultrafine particles):
Good
18.9/100
Pollen forecast in Letterkenny
View pollen forecastFrequently Asked Questions
Is air quality bad in Letterkenny right now?
On 16 July 2026, overall air quality in Letterkenny is fair. AQI is the main air quality indicator at 28.9/100. Pollution peaks around 11:00 PM (O3: 28.9/100).
Will air quality be worse tomorrow in Letterkenny?
On 17 July 2026, air quality conditions in Letterkenny will be similar to today, with AQI forecast at fair at 29.0/100. Pollution peaks around 12:00 AM (O3: 29.0/100).
When is air pollution at its worst in Letterkenny?
The air over Letterkenny varies through the year, influenced by its riverside setting on the River Swilly in County Donegal. Calm winter evenings can trap smoke from turf and coal fires close to the ground, while the rest of the year stays generally clean thanks to frequent Atlantic winds and rain. Away from the town centre, conditions tend to stay a little cleaner even on the stillest winter nights.
Are air quality levels in Letterkenny 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.
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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