Air quality in Sines, Portugal today

Mr. Duck’s Air Quality Score

Good air today for Sines, 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 Sines today is classified as Good. According to the latest assessment, the primary pollutant is PM2.5. The evaluation is based on nine valid measurements collected for particulate matter. These measurements provide the basis for the overall category and identify PM2.5 as the dominant component in the current air sample.

The reported reference value for PM2.5 is 0.0, and the reference value for PM10 is 7.8. These reference values are used to contextualize the relevant measurement set. Data is shown via OpenAQ, which publicly aggregates the observations daily from the monitoring sites. 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 Sines includes five measured pollutants – nitrogen dioxide (NO2), ozone (O3), particulate matter 10 µm (PM10), particulate matter 2.5 µm (PM2.5) and sulphur dioxide (SO2) – all reported in micrograms per cubic metre. The figures come from two monitoring stations that together provide ten rows of observations. Freshness is modest: eight of the rows were updated within the last 30 days, while the remaining two are older than a month. No data were recorded today or in the past week. The most recent timestamp for every pollutant is 2026-02-10 21:00 UTC, so the latest values are still within the 30‑day freshness window but are not real‑time.

Across the five pollutants the recorded ranges are quite different. NO2 varies from 0.0 to 14.0 µg/m³ with a median of 7.0 µg/m³, indicating that typical values sit roughly halfway between the minimum and maximum. Ozone shows a higher baseline, spanning 49.0 to 80.0 µg/m³ and a median of 64.5 µg/m³, suggesting consistently elevated concentrations compared with the other gases. The particulate matter measurements are low‑level: PM10 ranges from 0.0 to 7.8 µg/m³ (median 3.9) and PM2.5 from 0.0 to 4.0 µg/m³ (median 2.0), both clustering near the lower end of their scales. SO2 is the only pollutant with a negative reading (‑1.0 µg/m³) and a minimum of –1.0, a median of 3.5 and a maximum of 8.0 µg/m³, which may point to sensor calibration quirks. Overall, the data give a snapshot of Sines’ air quality that is recent enough to be useful but limited in spatial coverage and timeliness, so conditions can still differ across the city and over shorter time intervals.

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 dataset for Sines includes nine valid measurements and is updated within 30 days, with the latest update recorded on 2026-02-10 at 21:00 UTC. These values reflect the conditions at the time of sampling and are intended to give a general overview of the city's air quality. Please note that air quality can vary by location and time within the city.

OpenAQ station rows