Air quality in Test Valley, England, United Kingdom today

Mr. Duck’s Air Quality Score

Good air today for Test Valley, 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 in Test Valley today is classified as Good. The primary pollutant measured is PM2.5 (fine particles). According to the latest data shown via OpenAQ, the reference value for PM2.5 is 3.0 µg/m³ and for PM10 it is 4.0 µg/m³, based on ten valid measurements.

These figures indicate that the concentrations of fine particulate matter are within the limits associated with a Good rating. 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 Test Valley pulls measurements from two monitoring stations and contains eleven individual rows of data. All eight pollutants tracked by OpenAQ are represented: nitrogen dioxide (NO₂), ozone (O₃), particulate matter in three size fractions (PM1, PM2.5 and PM10), sulfur dioxide (SO₂), relative humidity and temperature. For each pollutant the most recent reading is shown together with its unit, source location and timestamp.

The freshest observations are from 2026‑02‑10 20:00 UTC for NO₂, O₃, SO₂, PM2.5 and PM10, all recorded at Chilbolton Observatory – UKA00614 and updated within the last seven days. The median values for these five pollutants are identical to their single reported figures: 7 µg/m³ for NO₂, 66 µg/m³ for O₃, 2 µg/m³ for SO₂, 5.23 µg/m³ for PM2.5 and 15.88 µg/m³ for PM10, with the PM10 range spanning from 4 to 27.8 µg/m³ (10th‑percentile 6.38, 90th‑percentile 25.38). In contrast, PM1, relative humidity and temperature come from Walworth Road and were last updated on 2026‑02‑04 21:00 UTC, falling into the “updated within 30 days” bucket. Their single values are 5.08 µg/m³ for PM1, 64.34 % for relative humidity and 10.88 °C for temperature.

Because only two stations contribute data, coverage across the city is limited and some parameters rely on a single recent measurement. While most key pollutants have very fresh entries (within a week), the three variables from Walworth Road are older by about a month, indicating that conditions can differ between locations and over time. Users should keep in mind that the available figures represent snapshots rather than continuous monitoring across all parts of Test Valley.

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 Test Valley includes ten valid measurements and is refreshed regularly, with the latest update recorded on 2026‑02‑10 at 20:00 UTC; it is therefore considered “Updated within 3 days.” This information reflects a single snapshot in time and air quality can differ across neighbourhoods and throughout the day, so conditions may vary from those shown here.

OpenAQ station rows