Air quality in Derry/Londonderry, Northern Ireland, United Kingdom today

Mr. Duck’s Air Quality Score

Good air today for Derry/Londonderry, Northern Ireland, United Kingdom

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Derry/Londonderry is currently classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 7.0 and a PM10 reference value of 11.0, based on ten valid observations collected via OpenAQ.

Overall conditions meet the Good category criteria according to the latest data set. 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 OpenAQ feed for Derry/Londonderry currently provides data on nine measured variables – nitrogen dioxide (NO₂), ozone (O₃), particulate matter of three size fractions (PM1, PM2.5 and PM10), sulphur dioxide (SO₂), relative humidity, temperature and an additional metric labelled UM003 that is not present in the latest rows. The dataset comprises 16 individual rows drawn from three monitoring sites, meaning that each pollutant is not necessarily represented at every location. For example, the most recent values for NO₂, O₃, SO₂, PM10 and PM2.5 all come from the Derry Rosemount station (UKA00619) with timestamps on 2026‑02‑10 20:00 UTC (or 14:00 UTC for O₃), while PM1, relative humidity and temperature are only available from Ashgrove Park as of 2026‑02‑09 16:00 UTC. No rows were flagged as “old” or “unknown”, but six entries fall into the “old” freshness bucket, indicating that a portion of the data is older than seven days.

Across the pollutants with recent updates, the recorded concentrations show modest ranges. PM10 values sit between 11.0 and 15.74 µg/m³, with a median of 11.0 µg/m³; PM2.5 spans 7.0 to 14.42 µg/m³, median 8.0 µg/m³; NO₂ varies from 7.0 up to 17.0 µg/m³, median 12.0 µg/m³. Ozone displays the widest spread, from a minimum of 0.0 µg/m³ to a maximum of 74.0 µg/m³, with a median of 37.0 µg/m³, while SO₂ is confined between 5.0 and 10.0 µg/m³ (median 7.5 µg/m³). The single‑site measurements for PM1, relative humidity and temperature are all identical across the row set – 8.96 µg/m³, 64.85 % and 12.60 °C respectively – reflecting a lack of variability in those particular observations.

Overall, the dataset offers fairly fresh snapshots for most key pollutants, but coverage is uneven: half of the monitored variables are only reported from one location, and several rows are older than a week. Consequently, while the available figures give a useful snapshot of air quality at specific sites on 2026‑02‑09/10, conditions can differ across other parts of Derry/Londonderry and at times not captured by these measurements.

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 current dataset for Derry/Londonderry is based on ten valid measurements and was refreshed recently, with the latest update recorded at 2026‑02‑10T20:00:00+00:00; it is therefore considered updated within three days. This snapshot reflects conditions measured at specific monitoring points and times, but air quality can differ across neighbourhoods and throughout the day, so values may not represent every location in the city.

OpenAQ station rows