Air quality in St Helier, Jersey today
Mr. Duck’s Air Quality Score
Good air today for St Helier, Jersey
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in St Helier is currently classified as Good. The main pollutant identified is PM2.5, with a measured concentration of 4.68 µg/m³ based on five valid observations.
Data for this assessment are shown via OpenAQ and reflect the latest available readings. 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 current station data listed for this city is focused on particulate matter (PM). Only one pollutant, PM2.5, is available from the OpenAQ feed, and it comes from six separate measurement rows spread across St Helier. Five of those rows have been updated within the last three days, with the newest reading recorded at 2026-02-10 23:06 UTC, while one row is classified as older data.
Across the recent observations, PM2.5 values range from a low of 1.06 µg/m³ to a high of 5.22 µg/m³, with a median concentration of 4.64 µg/m³ and a typical value around 4.68 µg/m³ at the Mont Millais/College Hill Junction site. Because only PM2.5 is reported, there is no coverage for other common pollutants such as NO₂ or O₃ in this dataset. The predominance of very recent measurements suggests that most of the available data reflects current conditions, though the single older row indicates that some locations may not be updated as frequently, and air quality can still differ by neighbourhood and time of day.
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 data for St Helier are based on five valid measurements and were updated within three days, with the most recent reading recorded at 2026‑02‑10T23:06:36+00:00. These figures represent a snapshot of ambient conditions across the city; actual air quality can differ by specific location and time of day, so values may vary locally from what is shown here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Val Plaisant | pm25 | 1.06 | µg/m³ | 2025-08-27 23:53 UTC |
| Robin Hood junction | pm25 | 4.3 | µg/m³ | 2026-02-10 22:52 UTC |
| Beresford Street | pm25 | 5.22 | µg/m³ | 2026-02-10 23:03 UTC |
| Queen's Road Roundabout | pm25 | 5.02 | µg/m³ | 2026-02-10 22:54 UTC |
| Springfield (Roberts Garage) | pm25 | 4.6 | µg/m³ | 2026-02-10 22:59 UTC |
| Mont Millais/College Hill Junction | pm25 | 4.68 | µg/m³ | 2026-02-10 23:06 UTC |