Worst air pollution Chepstow, today and tomorrow
Today (16 July): Air quality in Chepstow 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 Chepstow is fair. AQI improves to medium; NO2 increases to fair; 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
Use our Strava plugin to check your own exposure.
Chepstow's air quality reflects its position within Monmouthshire, with local traffic and the town's built-up core as the main contributors. Onshore breezes help ventilate the town centre, keeping air quality at moderate levels typical for the region. Traffic on the A470 is the most significant local emissions source, especially at peak times.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Good
15.9/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
9.2/100
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
13.2/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Fair
21.8/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
12.3/100
Pollen forecast in Chepstow
View pollen forecastFrequently Asked Questions
Is air quality bad in Chepstow right now?
On 16 July 2026, overall air quality in Chepstow 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 Chepstow?
On 17 July 2026, air quality conditions in Chepstow will be similar to today, with NO2 forecast at fair at 21.8/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Chepstow?
Air quality in Chepstow isn't the same all year round — it really shifts with the seasons. Winter tends to be worst, with wood burning, home heating, and still, cold air trapping traffic fumes from the A470 closer to ground level. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter. Spring and autumn are typically the easiest months, air-quality-wise, for most residents.
Are air quality levels in Chepstow 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 Kingdom?
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