Worst air pollution Machynlleth, today and tomorrow
Today (16 July): Air quality in Machynlleth is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 29.5/100).
Tomorrow (17 July 2026): Air quality in Machynlleth is fair. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 34.9/100). 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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Rush-hour queues near the M4 are usually when readings climb the most. The air quality picture in Machynlleth reflects a typical Powys town, with traffic emissions and local commercial activity as key contributors. Moist Atlantic fronts help ventilate the town centre, keeping air quality at moderate levels typical for the region.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
29.5/100
PM2.5 (fine particles):
Good
10.7/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
14.0/100
O3 (ozone):
Fair
29.5/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
8.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
34.9/100
PM2.5 (fine particles):
Good
15.9/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Good
16.6/100
O3 (ozone):
Fair
34.9/100
SO2 (sulfur dioxide):
Good
6.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
13.9/100
Pollen forecast in Machynlleth
View pollen forecastFrequently Asked Questions
Is air quality bad in Machynlleth right now?
On 16 July 2026, overall air quality in Machynlleth is fair. AQI is the main air quality indicator at 29.5/100. Pollution peaks around 3:00 PM (O3: 29.5/100).
Will air quality be worse tomorrow in Machynlleth?
On 17 July 2026, air quality conditions in Machynlleth will be similar to today, with AQI forecast at fair at 34.9/100. Pollution peaks around 3:00 PM (O3: 34.9/100).
When is air pollution at its worst in Machynlleth?
Here's the thing about Machynlleth: air quality has a clear seasonal rhythm. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. Winter mornings can be the trickiest, with cold, still conditions trapping M4 traffic fumes and smoke from home fires close to the ground. For much of spring and autumn, things settle into a fairly unremarkable middle ground.
Are air quality levels in Machynlleth 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