Air quality in Santana, Portugal today
Mr. Duck’s Air Quality Score
Good air today for Santana, 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 Santana is classified as Good today. The primary pollutant measured is PM2.5 (fine particles). Recent data show a PM2.5 reference value of 4.1 µg/m³ and a PM10 reference value of 13.5 µg/m³, based on four valid measurements collected via OpenAQ.
Overall conditions meet the Good category criteria according to the latest assessment. 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 Santana includes four measured pollutants – nitrogen dioxide (NO2), ozone (O3), particulate matter 10 µm or less (PM10) and particulate matter 2.5 µm or less (PM2.5). All values come from a single monitoring station, giving one row per pollutant, so the total coverage consists of four rows of data. Each pollutant’s most recent observation was recorded on 2026‑02‑10 at 21:00 UTC and is flagged as having been updated within the last seven days, meaning the information is currently fresh.
Because there is only one measurement for each substance, the statistical summary shows no spread: the minimum, median, maximum, 10th percentile and 90th percentile are identical. NO2 registers at 4.6 µg/m³, O3 at 69.8 µg/m³, PM10 at 13.5 µg/m³ and PM2.5 at 4.1 µg/m³. This uniformity indicates that the dataset does not capture any temporal variation or range of values for these pollutants in Santana; it simply reflects the single snapshot taken at the last update.
Consequently, while the data are up‑to‑date, the spatial and temporal depth is limited to one location and one recent timestamp per pollutant. Users should keep in mind that air quality can differ across neighborhoods and over time, so this snapshot provides a point‑in‑time view rather than a comprehensive picture of conditions throughout the city.
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 current dataset for Santana includes four valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 21:00 UTC; it is therefore “Updated within 3 days.” While these figures give a reliable snapshot of overall conditions, air quality can differ across neighbourhoods and change throughout the day, so local variations may not be fully captured in this summary.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Santana | no2 | 4.6 | µg/m³ | 2026-02-10 21:00 UTC |
| Santana | o3 | 69.8 | µg/m³ | 2026-02-10 21:00 UTC |
| Santana | pm10 | 13.5 | µg/m³ | 2026-02-10 21:00 UTC |
| Santana | pm25 | 4.1 | µg/m³ | 2026-02-10 21:00 UTC |