Air quality in Tuen Mun District, Hong Kong, China today

Mr. Duck’s Air Quality Score

Moderate air today for Tuen Mun District, Hong Kong, China

⚠️ 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 Tuen Mun District is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 21.8 and a PM10 reference value of 31.7, based on five valid observations.

Data are shown via OpenAQ. 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 Tuen Mun District includes six measured pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM₁₀), particulate matter ≤ 2.5 µm (PM₂.₅) and sulphur dioxide (SO₂). Data are drawn from a total of seven recent rows, representing two monitoring stations that have reported within the past three days. All six pollutants share the same most‑recent timestamp of 2026-02-10 22:00 UTC, indicating that the latest readings are uniformly fresh across the board.

Across the available records, PM₂.₅ shows the widest spread, ranging from a minimum of 0.0 µg/m³ to a maximum of 21.8 µg/m³ with a median value of 10.9 µg/m³; the 10th and 90th percentiles sit at 2.18 µg/m³ and 19.62 µg/m³ respectively, highlighting considerable variability in fine‑particle concentrations. In contrast, CO, NO₂, O₃, PM₁₀ and SO₂ each have a single reported value – 611.7 µg/m³ for CO, 60.7 µg/m³ for NO₂, 26.7 µg/m³ for O₃, 31.7 µg/m³ for PM₁₀ and 2.1 µg/m³ for SO₂ – with no observed range or distribution in the current snapshot.

The coverage is uneven: while PM₂.₅ benefits from multiple observations that allow a statistical view, the other five pollutants are represented by only one row each, limiting insight into their short‑term fluctuations. Because the dataset relies on just two stations, conditions can differ across the district and at times not captured by these recent 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 data shown reflect five valid measurements and were updated within three days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. While this provides a current snapshot of air quality for Tuen Mun District, conditions can differ across neighbourhoods and change throughout the day, so values may not represent every location or moment within the city.

OpenAQ station rows