Air quality in Almada, Portugal today

Mr. Duck’s Air Quality Score

Good air today for Almada, 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 Almada today is classified as Good. The primary pollutant identified is PM2.5, with a measured concentration of 0.0 µg/m³ based on seven valid observations reported through OpenAQ.

Overall conditions meet the Good category criteria, and the data set includes seven recent measurements for fine particulate matter. 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 Almada contains measurements for eight pollutants – carbon monoxide (CO), nitrogen dioxide (NO2), ozone (O3), particulate matter of three size fractions (PM1, PM2.5 and PM10), relative humidity and temperature – collected from a total of 13 sensor rows across two monitoring sites. The most recent observations were recorded on 2026‑02‑10 at 21:00 UTC for CO, NO2, O3 and both PM10 and PM2.5, while the remaining variables (PM1, relative humidity and temperature) were last updated on 2026‑02‑09 at 11:00 UTC.

Across the pollutants the amount of data varies markedly. CO, NO2 and O3 each have a single recent value (222 µg/m³ for CO, 7.4 µg/m³ for NO2 and 54.0 µg/m³ for O3) recorded at the Laranjeiro site. PM10 is represented by two rows with a median of about 17.8 µg/m³ and an observed range from –1.0 to 36.7 µg/m³, while PM2.5 also has two rows but all values are –1.0 µg/m³, indicating missing or placeholder data. PM1, relative humidity and temperature each have a single recent entry from the Quinta do Texugo site, showing 0.0 µg/m³ for PM1, 77.09 % humidity and a temperature of 16.02 °C.

These figures illustrate that coverage is uneven: some pollutants are reported from only one sensor, others from two, and several measurements contain implausible negative values that suggest gaps in the record. Because the freshest timestamps are just a day old, the data reflect conditions at specific locations and times rather than a continuous city‑wide picture; actual air quality in Almada can differ across neighborhoods and over longer periods.

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 Almada is based on seven valid measurements and was refreshed recently, with the latest update recorded at 2026‑02‑10T21:00:00+00:00 (Updated within 3 days). These values represent a snapshot of ambient conditions captured by the monitoring network; air quality can differ across neighborhoods and change throughout the day, so local variations may not be reflected in this summary.

OpenAQ station rows