Air quality in Yeosu-si, South Korea today

Mr. Duck’s Air Quality Score

Good air today for Yeosu-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 Yeosu‑si is currently classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 9.0 µg/m³ and a PM10 level of 13.0 µg/m³, based on 48 valid observations collected through OpenAQ.

These values reflect the latest available data 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 Yeosu‑si air quality dataset contains recent measurements for six key pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂, written as NO2), ozone (O₃), particulate matter 10 µm or smaller (PM10), fine particulate matter 2.5 µm or smaller (PM2.5, written as PM25) and sulfur dioxide (SO₂). These values come from a total of 54 individual rows collected at eight monitoring stations across the city. All of the records were last refreshed on 2026‑02‑10 at 18:00 UTC, which falls within the “updated within 7 days” freshness bucket, so the data represent a very current snapshot of conditions.

Across the pollutants the observed values span modest ranges. CO varies from a low of 0.31 ppm to a high of 0.53 ppm with a median around 0.45 ppm; NO₂ is measured between 0.0065 ppm and 0.0164 ppm, median 0.0077 ppm; O₃ ranges from 0.0183 ppm up to 0.0357 ppm, median 0.0293 ppm. For the particulate matter, PM10 values sit between 9 µg/m³ and 21 µg/m³ (median 13 µg/m³) while PM2.5 runs from 2 µg/m³ to 19 µg/m³ with a median of 9 µg/m³. SO₂ is the lowest‑concentration gas, recorded between 0.0016 ppm and 0.0042 ppm, median 0.0023 ppm. The 10th‑percentile figures are close to the minima for each pollutant, indicating that most readings cluster toward the lower end of their respective ranges, while the 90th‑percentile values approach the maxima, showing a modest spread but no extreme outliers.

Because every pollutant in this set has data from the same eight stations and shares the identical timestamp, coverage is uniform across gases and particles for this snapshot. However, the overall number of rows (54) means that each station contributes only a handful of recent observations, so while the snapshot is fresh it captures limited temporal depth. Conditions can still differ between neighborhoods or change rapidly after the last update, so readers should keep in mind that these figures reflect a single point in time rather than continuous monitoring throughout Yeosu‑si.

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 Yeosu‑si includes 48 valid measurements and is refreshed Updated within 3 days, with the most recent values recorded at 2026‑02‑10T18:00:00+00:00. This snapshot reflects conditions at the time of collection; air quality can differ across neighborhoods and change throughout the day, so individual experiences may vary from the reported figures.

OpenAQ station rows