Air quality in Coronel, Biobio Region, Chile today

Mr. Duck’s Air Quality Score

Moderate air today for Coronel, Biobio Region, Chile

⚠️ 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 Coronel today is classified as Moderate. The primary pollutant measured is PM2.5 (fine particles). According to the latest data, the PM2.5 concentration is 22.0 µg/m³ and the accompanying PM10 level is 41.0 µg/m³, based on seven valid measurements.

Data is shown via OpenAQ. 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 Coronel includes six measured pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5) and sulfur dioxide (SO₂). Across the city there are 38 individual measurement rows drawn from eight monitoring stations, but the timeliness of those records varies considerably.

The most recent values for PM10, SO₂ and PM2.5 were all updated on 2026‑02‑10 at 13:00 UTC, showing a median PM10 concentration of 30.7 µg/m³ (range 18.21–182.3 µg/m³), a median SO₂ of 9.88 µg/m³ (range 1.21–15.25 µg/m³) and a median PM2.5 of 13.0 µg/m³ (range 9.08–22.0 µg/m³). In contrast, the latest CO, O₃ and NO₂ entries date back to 2021‑08‑20 at 21:00 UTC, with CO ranging from 290.78 to 5 903.73 µg/m³ (median 818.54 µg/m³), O₃ from 1.11 to 452.17 µg/m³ (median 29.70 µg/m³) and NO₂ from 0 to 33.99 µg/m³ (median 11.34 µg/m³). This mix of fresh and several‑year‑old data means that the current picture is more complete for particulate matter than for gases.

Overall, 14 of the rows have an unknown freshness status, while only seven are confirmed as updated within the last three days; the remaining entries are classified as old. Consequently, coverage is uneven – recent measurements exist for the two particulate metrics and SO₂, but the gas‑phase pollutants rely on older records. Because conditions can differ between stations such as Cerro Merquín and Coronel Sur, and because many data points are dated, users should keep in mind that the snapshot may not reflect short‑term variations across 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 data shown for Coronel reflects seven valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10 at 13:00 UTC. This snapshot represents conditions measured at specific monitoring points; air quality can differ across neighborhoods and change throughout the day, so the figures may not capture all local variations.

OpenAQ station rows