What is the air quality in Siheung?

Siheung, South Korea has an annual US AQI of 79 (Polluted) and average PM2.5 of 23.5 µg/m³, ranking #3743 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Siheung?

September is typically the cleanest month (AQI 60) and March the most polluted (AQI 96).

Where does Siheung's air quality data come from?

PM2.5: 1998–2026 (monitors 2017–2026, satellite 1998–2017; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Siheung, South Korea — Air Quality & Clean City Guide 2026

Siheung Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3743	Siheung, South Korea	Asia	AQI 79	PM2.5 23.5 µg/m³