Air quality in Busan, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Busan, 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 Busan is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measured concentrations show a PM2.5 value of 30.0 µg/m³ and a PM10 value of 38.0 µg/m³ based on 177 valid observations. The reported PM2.5 concentration equals the reference threshold of 30.0 µg/m³, while PM10 reaches its reference threshold of 38.0 µg/m³. A total of 177 valid measurements contributed to the current assessment.

Measurements are aggregated from multiple monitoring stations and made available through OpenAQ. Data is refreshed periodically to reflect the latest reporting period. The dataset spans several days of monitoring to ensure reliability. 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 Busan air‑quality feed contains six measured pollutants – carbon monoxide, nitrogen dioxide, ozone, particulate matter 10, particulate matter 2.5 and sulfur dioxide – collected from a network of 31 monitoring stations. Across all pollutants the dataset holds 248 individual rows, with 42 rows for nitrogen dioxide, ozone, PM10 and PM2.5, and 40 rows each for carbon monoxide and sulfur dioxide. The most recent observations for every pollutant were recorded on 2026‑02‑10 18:00 UTC at the 부산북항 site, where the latest values read 0.22 ppm for carbon monoxide, 0.0054 ppm for nitrogen dioxide, 0.0362 ppm for ozone, 26.0 µg/m³ for PM10, 20.0 µg/m³ for PM2.5 and 0.0018 ppm for sulfur dioxide.

Data freshness is limited: none of the rows are from the past three days, and there are no entries within the last week. Only 178 rows (about 72 percent) fall within the most recent 30 days, while the remaining 70 rows are older than a month. This means the current snapshot reflects conditions that may have changed since the last update. The recorded ranges show considerable variability: nitrogen dioxide values span from 0.0013 ppm up to the placeholder maximum of 9999 ppm, with a median of 0.012 ppm and the 10th‑90th percentile band between 0.0036 ppm and 0.0208 ppm. Ozone’s median sits at 0.0298 ppm, bounded by 0.0165 ppm (10th percentile) and 0.0409 ppm (90th). Particulate matter shows a median of 26 µg/m³ for PM10 (10th‑90th range 16–37.9 µg/m³) and 20.5 µg/m³ for PM2.5 (8.2–29.7 µg/m³). Carbon monoxide’s median is 0.295 ppm, with a spread from 0.219 ppm to 0.465 ppm, while sulfur dioxide’s median is 0.00265 ppm, ranging between 0.0021 ppm and 0.00485 ppm. The dataset therefore offers a broad but temporally uneven picture of Busan’s air quality, with many stations represented but a notable proportion of older measurements.

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 Busan includes 177 valid measurements and is updated within 30 days. The most recent update was on 2026-02-10 at 18:00 UTC. Values represent an aggregate of citywide monitoring stations and are subject to occasional gaps due to maintenance or sensor downtime. Air quality can vary by location and time within the city.

OpenAQ station rows