Air quality in Daejeon, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Daejeon, 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 Daejeon is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 35.0 and a PM10 reference value of 38.0, based on 84 valid observations collected through OpenAQ.

These figures reflect the present conditions 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 Daejeon air‑quality dataset currently contains measurements from 14 monitoring stations, each providing a row of data for six common 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 stations reported their most recent values on 2026‑02‑10 at 18:00 UTC, so the freshest timestamp for every pollutant is the same moment, indicating that the latest observations are uniformly recent across the board.

The recorded concentrations show a modest spread. For CO the values range from 0.32 to 0.54 ppm with a median of about 0.41 ppm; NO2 varies between 0.0022 and 0.0304 ppm, centering near 0.016 ppm; O3 is observed from 0.0029 up to 0.0447 ppm, with a typical level around 0.020 ppm. Particulate matter displays broader absolute differences: PM10 values lie between 12 and 42 µg/m³ (median 33.5 µg/m³) while PM2.5 spans 8 to 35 µg/m³ (median 29 µg/m³). Sulfur dioxide is the most tightly clustered, ranging only from 0.0021 to 0.0028 ppm with a median of 0.0024 ppm.

Because every pollutant has data from the same set of stations and the latest update is within the past week, coverage is consistent and recent for Daejeon. However, the number of rows (14) represents a limited snapshot of city‑wide conditions; variations can still occur in neighborhoods or at times outside the reporting window.

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 Daejeon includes 84 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 the latest available data, air quality can differ across neighborhoods and change throughout the day, so this snapshot may not represent conditions everywhere in the city at any given moment.

OpenAQ station rows