Environment in Köln 13 indicators covering environment for Köln. IndicatorLatest Year10-yr change Rank Drought - Cities and FUAs — Land soil moisture anomaly -2.5 Percentage change 2025 down 159.5% 624th Greenhouse gas emissions - Cities and FUAs — GHG emissions from waste 0.08 Tonnes of CO2-equivalent 2024 down 27.3% 368th Total and environment-related patents - FUAs — Patent applications 390.8 Patents 2022 down 13.6% 39th Land surface temperature - Cities and FUAs — Daytime summer land 28.69 Degrees celsius 2024 down 14.8% 840th Land surface temperature - Cities and FUAs — Daytime winter land 3.45 Degrees celsius 2024 down 15.5% 1069th Land surface temperature - Cities and FUAs — Daytime yearly land 19.25 Degrees celsius 2024 down 11.4% 942nd Land surface temperature - Cities and FUAs — Nighttime summer land 14.88 Degrees celsius 2024 down 9.2% 877th Land surface temperature - Cities and FUAs — Nighttime winter land -1.25 Degrees celsius 2024 up 53.9% 877th Land surface temperature - Cities and FUAs — Nighttime yearly land 7.12 Degrees celsius 2024 down 10.4% 873rd Air pollution - Cities and FUAs — Population exposure to nitrogen 56.52 Microgrammes per cubic metre 2025 — 45th Air pollution - Cities and FUAs — Population exposure to ozone 63.79 Microgrammes per cubic metre 2025 — 949th Air pollution - Cities and FUAs — Population exposure to PM10 39.36 Microgrammes per cubic metre 2025 — 582nd Air pollution - Cities and FUAs — Population exposure to PM2.5 30.71 Microgrammes per cubic metre 2025 — 494th