Air quality in Santiago, Santiago Metropolitan Region, Chile today

Mr. Duck’s Air Quality Score

Moderate air today for Santiago, Santiago Metropolitan 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 Santiago today is classified as Moderate. The primary pollutant measured is PM2.5 (fine particles). According to the latest data shown via OpenAQ, the concentration of PM2.5 is 17.0 µg/m³ and the accompanying PM10 level is 45.0 µg/m³, based on two valid measurements.

These values reflect the current assessment for Santiago in the Santiago Metropolitan Region of Chile. 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 Santiago 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). Data come from eight individual rows that represent two monitoring stations, so each station contributes several pollutant readings. The most recent observations are for the fine particles: PM10 and PM2.5 were last updated on 2026-02-10 13:00 UTC, with values ranging from 45 µg/m³ to 147 µg/m³ (median 96 µg/m³) for PM10 and from 17 µg/m³ to 100 µg/m³ (median 58.5 µg/m³) for PM2.5. In contrast, the other gases are much older – CO, NO₂ and O₃ all date back to August 2021, while SO₂ is from June 2017. Their single‑record values are 1511.14 µg/m³ for CO, 95.13 µg/m³ for NO₂, 0.59 µg/m³ for O₃ and 0.0 µg/m³ for SO₂.

Because only two stations supply the data, coverage across the metropolitan area is limited and the timestamps show a clear imbalance: recent information exists solely for particulate matter, whereas gaseous pollutants rely on historic measurements that may no longer reflect current conditions. The spread of PM10 values (45–147 µg/m³) and PM2.5 values (17–100 µg/m³) indicates considerable variability within the limited sample set, while the single‑point readings for the gases provide no insight into their range or day‑to‑day changes.

Overall, the dataset offers a snapshot of Santiago’s air quality that is freshest for particles but largely outdated for gases. Users should keep in mind that with only two monitoring locations and many old records, conditions can differ across neighborhoods and times not captured by these observations.

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 reflect two valid measurements and are Updated within 3 days, with the latest values recorded at 2026‑02‑10T13:00:00+00:00. This snapshot provides a brief overview of Santiago’s air quality but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows