Air quality in Cheorwon-gun, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy air today for Cheorwon-gun, 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 in Cheorwon‑gun is currently classified as Unhealthy. The primary pollutant identified is PM2.5, with a measured concentration of 63.0 µg/m³. In addition, the PM10 level stands at 73.0 µg/m³ based on twelve valid observations reported through OpenAQ.

These values reflect the present conditions for the area and are provided solely for informational purposes. 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 Cheorwon‑gun air quality dataset currently contains measurements from two monitoring stations, each providing a full set of 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 sulfur dioxide (SO2). All values were last reported on 2026‑02‑10 at 18:00 UTC, so the data are fresh within the past week for every pollutant.

Across the two stations the observed concentrations show a relatively narrow spread. CO ranges from 0.51 to 0.61 ppm with a median of 0.56 ppm; NO2 varies between 0.0171 and 0.0182 ppm, median 0.01765 ppm; O3 is recorded from 0.0101 up to 0.0173 ppm, median 0.0137 ppm. The particulate matter measurements are higher in absolute terms: PM10 values lie between 73 and 98 µg/m³ (median 85.5 µg/m³) and PM2.5 between 63 and 66 µg/m³ (median 64.5 µg/m³). SO2 is the lowest‑level gas, ranging from 0.0013 to 0.0027 ppm with a median of 0.002 ppm.

The dataset’s completeness is uniform: every pollutant has two recent records, and there are no entries flagged as old, unknown or missing for any of them. The percentile distribution shows that the 10th‑percentile values are close to the minima (e.g., CO 0.52 ppm, PM10 75.5 µg/m³) while the 90th‑percentile values approach the maxima (e.g., O3 0.01658 ppm, PM2.5 65.7 µg/m³), indicating limited variability across the monitoring sites. Because only two stations contribute data, spatial differences within Cheorwon‑gun cannot be captured; conditions may differ in areas farther from these points despite the overall freshness of the measurements.

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 Cheorwon‑gun is based on twelve valid measurements and was refreshed within the past three days, with the latest update recorded at 2026‑02‑10T18:00:00+00:00. This snapshot reflects conditions captured at that time; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows