Air Pollution Concentration in Ulaanbaatar (2002-2026)

Monthly average sulphur dioxide (SO₂) concentration in Ulaanbaatar from 2002 to 2026, averaged across 17 city monitoring stations. SO₂ peaked at 0.216 mg/m³ in January 2021; all 296 months in the series have data. Replaces the discontinued PM2.5/PM10 source tables.