Air quality in Jeju, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Jeju, 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 Jeju is currently classified as Moderate. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 12.0 µg/m³ and a PM10 level of 24.0 µg/m³, based on 48 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 Jeju air‑quality feed currently includes six measured pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or smaller (PM₁₀), particulate matter 2.5 µm or smaller (PM₂.₅) and sulfur dioxide (SO₂). Data come from eight monitoring stations, each providing a recent snapshot that was last updated on 2026‑02‑10 at 18:00 UTC; every pollutant entry carries the same “updated within 7 days” note, indicating that the dataset reflects conditions observed only a few days ago.

Across the eight rows, CO values range from a low of 0.17 ppm to a high of 0.46 ppm, with a median around 0.34 ppm and most readings clustered between roughly 0.23 ppm (10th percentile) and 0.45 ppm (90th percentile). NO₂ shows a tighter spread, from 0.0035 ppm up to 0.0153 ppm, median 0.0052 ppm, and the central 80 % of observations falling between 0.0038 ppm and 0.0149 ppm. O₃ concentrations vary between 0.0216 ppm and 0.0476 ppm, centering on a median of about 0.045 ppm; again the bulk of values sit close to the upper end of that range (41 %‑46 %). For particulate matter, PM₁₀ exhibits an especially wide distribution: the minimum recorded is 10 µg/m³, the maximum reaches an extreme 9 999 µg/m³, while the median sits at 21.5 µg/m³ and the inter‑decile band stretches from roughly 11 µg/m³ to over 1 028 µg/m³. PM₂.₅ is less variable, spanning 3 µg/m³ to 36 µg/m³ with a median of 9.5 µg/m³ and the central 80 % between about 6.6 µg/m³ and 16.2 µg/m³. SO₂ values are tightly grouped, ranging from 0.0013 ppm to 0.0019 ppm, median 0.0017 ppm, with essentially all readings falling within the narrow 10th‑90th percentile band of 0.0013–0.0019 ppm.

Overall, the dataset offers a fairly fresh picture of Jeju’s air quality, but the breadth of values differs markedly among pollutants. While gases such as CO, NO₂, O₃ and SO₂ show relatively compact ranges, particulate matter—especially PM₁₀—covers an extremely broad spectrum, suggesting that local sources or measurement conditions can drive large fluctuations in dust‑related concentrations. Because the data are drawn from only eight stations, spatial variation across the island may not be fully captured; conditions at any given location could differ from the city‑wide averages presented here.

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 Jeju includes 48 valid measurements and is updated within 3 days, with the most recent values recorded at 2026‑02‑10T18:00:00+00:00. These figures represent a snapshot of current conditions; air quality can differ across neighborhoods and change throughout the day, so local variations may not be reflected in this summary.

OpenAQ station rows