Air quality in City of Westminster, England, United Kingdom today

Mr. Duck’s Air Quality Score

Moderate air today for City of Westminster, England, 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 today in the City of Westminster is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measured concentrations show a PM2.5 level of 25.74 µg/m³ and a reference value for PM10 of 15.0 µg/m³.

Data are based on fourteen valid measurements collected via OpenAQ. These figures reflect the current monitoring snapshot for Westminster. 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 the City of Westminster currently provides data from six monitoring sites, representing a total of twenty‑two recent observations across eleven measured pollutants: carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), combined nitrogen oxides (NOX), ozone (O₃), particulate matter ≤ 10 µm (PM10), particulate matter ≤ 2.5 µm (PM2.5), relative humidity, sulfur dioxide (SO₂) and temperature. The most recent readings were recorded on 2026‑02‑10, with timestamps ranging from 19:00 UTC for CO to 21:00 UTC for relative humidity and temperature, so the freshest data are only a few hours old.

Across the dataset, PM2.5 values span from about 11 µg/m³ up to 48 µg/m³, with a median of roughly 19 µg/m³; NO₂ ranges between 15.5 and 37 µg/m³ (median ≈ 34 µg/m³); O₃ is tightly clustered between 32 and 33.6 µg/m³ (median ≈ 33 µg/m³); PM10 varies narrowly from 15 to 16 µg/m³ (median ≈ 15.5 µg/m³). Relative humidity is consistently around 70 % (minimum 70.24 %, maximum 70.55 %) and temperature stays near 12.6 °C (range 12.53‑12.61 °C). Single‑point measurements show CO at 465.68 µg/m³ and SO₂ at 2.0 µg/m³.

The coverage is uneven: while PM2.5, NO₂, O₃, PM10, humidity and temperature have multiple recent samples (two to five rows each), CO, SO₂ and the other nitrogen oxides are represented by only one recent row each. Of the twenty‑two observations, fifteen were recorded within the last seven days, seven are older than seven days, and none fall into the “today” or “unknown” categories. This mix of fresh and slightly dated entries means that conditions can differ across Westminster’s neighborhoods and over short time spans, so the snapshot should be interpreted as a recent but not exhaustive picture of air quality in the city.

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 Westminster includes 14 valid measurements and is refreshed Updated within 3 days, with the most recent data recorded at 2026‑02‑10T21:00:00+00:00. This snapshot reflects conditions captured during that reporting period; however, air quality can differ across neighbourhoods and change throughout the day, so values shown may not represent every location or moment within the city.

OpenAQ station rows