Worst air pollution Pwllheli, today and tomorrow
Today (16 July): Air quality in Pwllheli is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 28.5/100).
Tomorrow (17 July 2026): Air quality in Pwllheli is fair. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 31.9/100). 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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Traffic on the A55 is the most significant local emissions source, especially at peak times. Pwllheli sits within Gwynedd, and its air quality profile is driven mainly by road traffic and the density of the centre. Shifting coastal winds do most of the work keeping things in check, more so than any local policy or infrastructure change.
Today - 16 July | Pollution peaks at 14:00
AQI:
Fair
28.5/100
PM2.5 (fine particles):
Good
11.5/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
11.9/100
O3 (ozone):
Fair
28.5/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
9.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
31.9/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Good
16.7/100
O3 (ozone):
Fair
31.9/100
SO2 (sulfur dioxide):
Good
4.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
13.3/100
Pollen forecast in Pwllheli
View pollen forecastFrequently Asked Questions
Is air quality bad in Pwllheli right now?
On 16 July 2026, overall air quality in Pwllheli is fair. AQI is the main air quality indicator at 28.5/100. Pollution peaks around 2:00 PM (O3: 28.5/100).
Will air quality be worse tomorrow in Pwllheli?
On 17 July 2026, air quality conditions in Pwllheli will be similar to today, with AQI forecast at fair at 31.9/100. Pollution peaks around 3:00 PM (O3: 31.9/100).
When is air pollution at its worst in Pwllheli?
Here's the thing about Pwllheli: air quality has a clear seasonal rhythm. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter. The coldest months usually bring the worst readings, as heating and temperature inversions keep A55 emissions from dispersing normally. Most of spring and autumn stays fairly steady, right in the middle of those two extremes.
Are air quality levels in Pwllheli 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