Air quality in Cheonan-si, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Cheonan-si, South Korea

⚠️ 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 today in Cheonan‑si is classified as USG. The main pollutant identified is PM2.5, with a measured concentration of 45.0 µg/m³ and a concurrent PM10 level of 31.0 µg/m³ based on 29 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 dataset for Cheonan‑si contains measurements for six 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). A total of 36 individual rows are recorded across five monitoring stations, all of which were last updated on 2026‑02‑10 at 18:00 UTC, so the information is current within the past week for every pollutant.

Across the city the observed values span a fairly wide range. CO readings vary from 0.36 ppm up to 0.49 ppm with a median of about 0.42 ppm; NO₂ ranges between 0.0056 ppm and 0.0149 ppm, centering around 0.009 ppm; O₃ is measured from 0.0192 ppm to 0.0379 ppm with a typical value near 0.029 ppm. For the particulate matter, PM10 shows an extreme maximum of 9999 µg/m³ while most recent values sit between 19 and 32 µg/m³ (median 32 µg/m³); PM2.5 is bounded by 10 to 45 µg/m³ with a median of 24 µg/m³. SO₂ concentrations are low, ranging from 0.0027 ppm to 0.0036 ppm and averaging about 0.0033 ppm.

The data illustrate that while all six pollutants are represented, the spread differs markedly: particulate matter has the broadest distribution, especially PM10 where a single very high outlier pushes the maximum far above typical levels. In contrast, the gases (CO, NO₂, O₃, SO₂) show tighter ranges and consistent recent updates. Because measurements come from only five stations, conditions can still vary across neighborhoods, so the figures reflect the locations sampled rather than city‑wide averages.

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 Cheonan‑si includes 29 valid measurements and is updated within 3 days, with the most recent values recorded at 2026‑02‑10T18:00:00+00:00. While these figures reflect current monitoring conditions, air quality can differ across neighborhoods and change throughout the day, so this snapshot may not represent every location or moment in the city.

OpenAQ station rows