Air quality in Monmouthshire, Wales, United Kingdom today
Mr. Duck’s Air Quality Score
Good air today for Monmouthshire, Wales, United Kingdom
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Monmouthshire today is classified as Good. The primary pollutant measured is PM2.5 (fine particles).
Three valid measurements were recorded, showing a PM2.5 reference value of 6.0 and a PM10 reference value of 8.0. These figures reflect the current monitoring data provided via OpenAQ for this location. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
The dataset for Monmouthshire pulls hourly readings from a single monitoring site, Chemins A48 in Chepstow, and currently includes three measured pollutants: nitrogen dioxide (NO2), particulate matter 10 µm or less (PM10) and particulate matter 2.5 µm or less (PM2.5). All three pollutant streams have recent observations – the latest NO2 value was recorded on 2026‑02‑10 at 11:00 UTC, while the most recent PM10 and PM2.5 measurements were taken on 2026‑02‑10 at 16:00 UTC. Because each of these timestamps falls within the past seven days, the data are considered fresh for all pollutants.
Across the three pollutant types the recorded values are identical to their minimum, median and maximum, indicating that only a single measurement is currently available for each. NO2 registers at 43.0 µg/m³, PM10 at 8.0 µg/m³ and PM2.5 at 6.0 µg/m³. The narrow spread – with the 10th and 90th percentiles matching the single value – shows no observed variability in this snapshot.
With just one monitoring row contributing data, coverage is limited to a specific location within Monmouthshire. Consequently, while the figures give an up‑to‑date picture of air quality at Chepstow A48, they do not capture spatial differences that may exist elsewhere in the county or changes over longer periods. Users should keep in mind that conditions can differ across neighborhoods and times beyond the moment captured by these recent readings.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The dataset for Monmouthshire includes three valid measurements and is refreshed regularly, having been updated within the past three days (last update: 2026‑02‑10T16:00:00+00:00). These values represent a snapshot of current conditions; however, air quality can vary across different locations and times within the city, so individual experiences may differ from the reported figures.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Chepstow A48 | no2 | 43.0 | µg/m³ | 2026-02-10 11:00 UTC |
| Chepstow A48 | pm10 | 8.0 | µg/m³ | 2026-02-10 16:00 UTC |
| Chepstow A48 | pm25 | 6.0 | µg/m³ | 2026-02-10 16:00 UTC |