Air quality in Chungju-si, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Chungju-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 Chungju‑si is classified as USG. The primary pollutant identified is PM2.5, with a measured reference value of 52.0 µg/m³, while PM10 shows a reference value of 60.0 µg/m³ based on 24 valid measurements.

Data are shown via OpenAQ and reflect the current monitoring results for the city. 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 Chungju‑si contains measurements from four monitoring stations, each providing a full set of six common air‑quality 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). All stations reported their latest values on 2026‑02‑10 at 18:00 UTC, so the most recent data are less than a week old for every pollutant.

Across the four sites the observed concentrations span modest ranges. CO varied from a low of 0.49 ppm to a high of 1.12 ppm, with a median around 0.70 ppm; NO₂ was between 0.0143 ppm and 0.0282 ppm (median ≈ 0.0198 ppm); O₃ ranged from 0.0057 ppm up to 0.028 ppm (median ≈ 0.0128 ppm). Particulate matter showed broader absolute values: PM₁₀ measured between 33 µg/m³ and 69 µg/m³, median 58 µg/m³; PM₂.₅ was recorded from 26 µg/m³ to 52 µg/m³, median 48 µg/m³. SO₂ values were the smallest of all, from 0.0017 ppm to 0.0032 ppm with a median near 0.0024 ppm.

The data set is complete for each pollutant—no rows are missing or marked unknown—and every station contributed recent readings, giving a consistent snapshot of current air quality across the city. However, the spread between minimum and maximum values differs by pollutant: particulate matter shows a relatively wide variation (≈ 33–69 µg/m³ for PM₁₀), while gases such as CO, NO₂, O₃ and SO₂ remain within tighter bands. This indicates that spatial differences are more pronounced for particles than for the measured gases, even though all measurements were taken at the same recent timestamp.

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 set for Chungju‑si includes 24 valid measurements and is refreshed regularly, having been updated within the past three days (last update: 2026‑02‑10T18:00:00+00:00). These figures represent a snapshot of conditions at the time of collection; actual air quality can differ across neighborhoods and change throughout the day.

OpenAQ station rows