Air quality in Ermesinde, Portugal today
Mr. Duck’s Air Quality Score
Good air today for Ermesinde, Portugal
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Ermesinde today is classified as Good. The primary pollutant measured is PM10, with a reference value of 19.2 µg/m³. Three valid measurements contributed to this assessment, and the data are shown via OpenAQ. No PM2.5 reference value is provided for this location. Measured concentrations are within the limits defined for the Good category.
These observations reflect the current conditions without indicating any trend. The data snapshot represents conditions at the time of measurement. 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 Ermesinde data set currently contains three measured pollutants – nitrogen dioxide (NO2), ozone (O3) and particulate matter 10 µm (PM10) – all recorded from a single monitoring location identified as Ermesinde‑Valongo. In total there are three rows of data, one for each pollutant, so the coverage reflects a point‑source snapshot rather than a city‑wide network. The most recent timestamps show that NO2 and PM10 were last updated on 2026‑02‑10 at 21:00 UTC, which places them well within the past 30 days. Ozone, by contrast, was last refreshed on 2026‑01‑24 at 11:00 UTC; while still within a month of the current date, it is flagged as older data relative to the other two measurements.
Each pollutant entry reports a single value that serves as the minimum, median and maximum for the recorded period, indicating no observed spread in the limited sample. NO2 registers at 13.8 µg/m³, O3 at 79.0 µg/m³ and PM10 at 19.2 µg/m³, with the 10th and 90th percentiles matching these figures as well. This uniformity means the dataset provides a static snapshot rather than a range of conditions. Because only one station contributes data, variations that might occur across different neighborhoods or times of day are not captured, and users should keep in mind that the reported numbers represent conditions at a specific point and moment in Ermesinde.
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 set for Ermesinde includes three valid measurements and has been updated within 30 days, with the latest reading recorded on 2026-02-10 at 21:00 UTC. This snapshot reflects conditions at the time of measurement; air quality can differ across neighborhoods and change throughout the day, so values may not represent the entire city at all times.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Ermesinde-Valongo | no2 | 13.8 | µg/m³ | 2026-02-10 21:00 UTC |
| Ermesinde-Valongo | o3 | 79.0 | µg/m³ | 2026-01-24 11:00 UTC |
| Ermesinde-Valongo | pm10 | 19.2 | µg/m³ | 2026-02-10 21:00 UTC |