Worst air pollution Caerphilly, today and tomorrow
Today (16 July): Air quality in Caerphilly 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: 34.0/100).
Tomorrow (17 July 2026): Air quality in Caerphilly is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 43.6/100). 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
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The air quality picture in Caerphilly reflects a typical Caerphilly town, with traffic emissions and local commercial activity as key contributors. Commuter traffic feeding onto the A470 adds a further, consistent contribution to local readings. Inland breezes from the surrounding countryside do most of the work keeping things in check, more so than any local policy or infrastructure change.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
8.8/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
10.1/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
8.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
12.0/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Good
14.3/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
11.2/100
Pollen forecast in Caerphilly
View pollen forecastFrequently Asked Questions
Is air quality bad in Caerphilly right now?
On 16 July 2026, overall air quality in Caerphilly is fair. AQI is the main air quality indicator at 34.0/100. Pollution peaks around 3:00 PM (O3: 34.0/100).
Will air quality be worse tomorrow in Caerphilly?
On 17 July 2026, air quality conditions in Caerphilly will be better than today, with AQI forecast at medium at 43.6/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Caerphilly?
Most of spring and autumn stays fairly steady, right in the middle of those two extremes. Seasons make a real difference to air quality in Caerphilly, more than most people realise. Winter mornings can be the trickiest, with cold, still conditions trapping A470 traffic fumes and smoke from home fires close to the ground. Summer brings a different issue — stronger sunlight can push up ozone levels on hot, sunny days, even though traffic pollution itself often disperses more easily.
Are air quality levels in Caerphilly 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