Air quality in Chillán, Nuble Region, Chile today

Mr. Duck’s Air Quality Score

Moderate air today for Chillán, Nuble 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 Chillán today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 value of 14.0 µg/m³ and a PM10 value of 33.0 µg/m³, based on two valid observations.

Data are 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 Chillán air‑quality dataset currently contains measurements for six pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM10), particulate matter 2.5 µm or less (PM2.5) and sulphur dioxide (SO₂). The data come from eight individual rows that are grouped into two monitoring stations, so the spatial coverage is limited to a small number of locations within the city.

For the fine particles, the most recent values were recorded on 2026‑02‑10 at 13:00 UTC. PM10 readings range from a low of 20 µg/m³ to a high of 33 µg/m³, with a median of 26.5 µg/m³; the 10th and 90th percentiles sit at about 21 µg/m³ and 32 µg/m³ respectively, indicating a relatively narrow spread around the typical level. PM2.5 shows a minimum of 14 µg/m³, a maximum of 28.06 µg/m³ and a median of 21.03 µg/m³; its percentile range (≈15 µg/m³ to ≈27 µg/m³) is similarly tight. Both particle metrics are flagged as “Updated within 3 days,” reflecting that the latest data are only a few days old.

In contrast, the gaseous pollutants all have their most recent entries dated 2017‑06‑28 at 16:00 UTC and are marked as “Old data.” For CO, NO₂, O₃ and SO₂ the recorded values are uniformly zero across the available rows, with no variation reported. This stark difference in timestamp freshness means that while particulate matter information is current and offers a clear picture of recent conditions, the gas‑phase measurements are outdated and provide limited insight into present‑day air quality. Consequently, any assessment of Chillán’s overall environment should consider that the dataset captures recent particle trends but relies on old or missing data for the other pollutants, and that conditions can differ across the city beyond what these few stations record.

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 Chillán are based on two valid measurements and were updated within 3 days, with the latest reading recorded at 2026‑02‑10T13:00:00+00:00. This snapshot reflects conditions at specific monitoring points and times; air quality can vary across different neighborhoods and moments throughout the city.

OpenAQ station rows