Air quality in Changwon-si, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Changwon-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 in Changwon‑si is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 27.0 and a PM10 reference value of 44.0, based on 78 valid observations collected through OpenAQ.

These figures reflect the present assessment for the city without implying any trend or cause. 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 Changwon‑si contains measurements of six common air pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂, written as NO2), ozone (O₃), particulate matter up to 10 µm (PM10), fine particulate matter up to 2.5 µm (PM2.5, shown as PM25) and sulfur dioxide (SO₂). All values come from a network of thirteen monitoring stations that report each pollutant separately; the same thirteen rows are present for every compound, giving a consistent spatial coverage across the city.

Each pollutant’s most recent reading was recorded on 2026‑02‑10 at 18:00 UTC, which falls within the “updated within 7 days” freshness category, so the data reflect current conditions rather than historic archives. The individual measurements show modest variability. CO values range from a low of 0.35 ppm to a high of 0.58 ppm, with a median of 0.41 ppm; NO₂ spans 0.0117‑0.0339 ppm (median 0.0222 ppm); O₃ varies between 0.0064 and 0.0201 ppm (median 0.0144 ppm). Particulate matter shows a broader spread: PM10 runs from 20 to 44 µg/m³ (median 29 µg/m³) while PM2.5 ranges from 12 to 36 µg/m³ (median 18 µg/m³). Sulfur dioxide is the least variable, recorded between 0.002 and 0.005 ppm with a median of 0.0023 ppm.

Because every pollutant is reported from the same thirteen stations, there is no gap in geographic coverage; however, the range of values differs noticeably across compounds. Gases such as CO, NO₂ and O₃ stay within relatively tight bands, whereas particulate matter exhibits a wider dispersion, indicating that local sources or atmospheric conditions may affect dust‑type pollutants more strongly. The uniform freshness of all timestamps means the snapshot captures a single moment across the city, but actual air quality can still change throughout the day and between neighborhoods.

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 Changwon‑si includes 78 valid measurements and is refreshed Updated within 3 days, with the most recent data recorded on 2026‑02‑10T18:00:00+00:00. This snapshot reflects conditions at the time of collection; air quality can vary by location and time within the city, so values may differ across neighborhoods or later periods.

OpenAQ station rows