Air quality in Lousã, Portugal today

Mr. Duck’s Air Quality Score

Good air today for Lousã, 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 Lousã is currently classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 7.51 µg/m³ based on ten valid observations recorded by OpenAQ.

Overall, the conditions meet the criteria for the Good category with no additional pollutants reported. 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 Lousã air‑quality record contains data for six measured variables – PM1, PM2.5, PM10, relative humidity, temperature and particle count (UM003). These values come from eleven individual rows collected at two monitoring sites, all located on the Quinta do Penedo lower terrace. For five of the pollutants the most recent reading was logged on 2026‑02‑10 22:00 UTC, which falls within the “updated within seven days” freshness category. PM10 is an outlier: its only available value dates back to 2025‑01‑13 23:00 UTC and is therefore classified as old data.

Across the recent observations the concentration of fine particles shows a modest spread. PM1 ranges from just under 0.01 µg/m³ up to 4.01 µg/m³, with a median around 2.01 µg/m³; PM2.5 varies between 0.43 µg/m³ and 7.51 µg/m³, median roughly 3.97 µg/m³. The particle count (UM003) spans from about 159 particles/cm³ to 841 particles/cm³, with a typical value near 500 particles/cm³. Temperature measurements are tightly clustered between 16.92 °C and 18.27 °C, median 17.59 °C, while relative humidity stays in the high‑60s to low‑70s percent range (63.7 %–71.1 %, median 67.4 %). PM10, based on a single historic entry, sits at 11.11 µg/m³.

Overall the dataset offers fairly fresh coverage for most pollutants but is limited in spatial breadth – only two stations contribute all rows – and uneven in temporal depth because PM10 lacks recent updates. Consequently, while the available numbers give a snapshot of current conditions at Quinta do Penedo, they may not capture variations that occur elsewhere in Lousã or reflect rapid changes between measurement times.

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 are based on ten valid measurements and were refreshed recently, having been updated within three days (last update 2026‑02‑10T22:00:00+00:00). This snapshot reflects conditions at the time of collection; air quality can differ across neighbourhoods and change throughout the day, so values may not represent every location or moment in Lousã.

OpenAQ station rows