Air quality in Valongo, Portugal today

Mr. Duck’s Air Quality Score

Moderate air today for Valongo, Portugal

⚠️ 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 Valongo is currently classified as Moderate. The main pollutant identified is PM2.5 (fine particles), with a measured concentration of 12.03 µg/m³ based on five valid observations reported through OpenAQ.

These measurements indicate that particulate matter levels are above the reference threshold for this category. 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 Valongo dataset contains five recorded parameters from a single monitoring station: PM1 at 5.41 µg/m³, PM2.5 at 12.03 µg/m³, relative humidity at 72.39 %, temperature at 16.17 °C and particle count (UM003) at 1 175.51 particles/cm³. All values share the same most‑recent timestamp of 2026-02-10 22:00 UTC, which falls within the “updated within 7 days” freshness bucket, indicating that the latest data are current.

Because only one station contributes to the record, the coverage is limited to a single point in Valongo rather than a citywide network. Nevertheless, each pollutant shows no variation across the available observations: the minimum, median and maximum values are identical for every metric, so the dataset reflects a snapshot rather than a range of conditions. The particle count (UM003) is notably higher in absolute terms than the mass‑based PM measurements, while humidity sits at a relatively high 72 % and temperature is modestly cool at just over 16 °C.

In summary, Valongo’s air‑quality feed provides up‑to‑date readings for five key variables but from only one location and without any observed spread in the values. Users should keep in mind that conditions can differ across neighborhoods and times of day, and the present data represent a single moment rather than a broader temporal or spatial picture.

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 for Valongo is based on five valid measurements and was refreshed recently, having been updated within 3 days (last update: 2026‑02‑10T22:00:00+00:00). This snapshot reflects conditions at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows