Environment in Ulsan 12 indicators covering environment for Ulsan. IndicatorLatest Year10-yr change Rank Drought - Cities and FUAs — Land soil moisture anomaly -13.6 Percentage change 2025 down 383.3% 1259th Greenhouse gas emissions - Cities and FUAs — GHG emissions from waste 0.49 Tonnes of CO2-equivalent 2024 up 32.4% 90th Land surface temperature - Cities and FUAs — Daytime summer land 31.07 Degrees celsius 2024 down 3.9% 586th Land surface temperature - Cities and FUAs — Daytime winter land 8.84 Degrees celsius 2024 up 32.8% 648th Land surface temperature - Cities and FUAs — Daytime yearly land 19.33 Degrees celsius 2024 up 3.4% 940th Land surface temperature - Cities and FUAs — Nighttime summer land 21.79 Degrees celsius 2024 up 3.6% 161st Land surface temperature - Cities and FUAs — Nighttime winter land 0.0798 Degrees celsius 2024 up 103.7% 728th Land surface temperature - Cities and FUAs — Nighttime yearly land 9.31 Degrees celsius 2024 up 16.0% 554th Air pollution - Cities and FUAs — Population exposure to nitrogen 23.76 Microgrammes per cubic metre 2025 — 772nd Air pollution - Cities and FUAs — Population exposure to ozone 70.85 Microgrammes per cubic metre 2025 — 849th Air pollution - Cities and FUAs — Population exposure to PM10 26.72 Microgrammes per cubic metre 2025 — 1048th Air pollution - Cities and FUAs — Population exposure to PM2.5 16.68 Microgrammes per cubic metre 2025 — 987th