Environment in Boulogne-sur-Mer 13 indicators covering environment for Boulogne-sur-Mer. IndicatorLatest Year10-yr change Rank Drought - Cities and FUAs — Land soil moisture anomaly -5.2 Percentage change 2025 down 5,300.0% 883rd Greenhouse gas emissions - Cities and FUAs — GHG emissions from waste 0 Tonnes of CO2-equivalent 2024 — 1178th Total and environment-related patents - FUAs — Patent applications 2.3 Patents 2022 up 666.7% 660th Land surface temperature - Cities and FUAs — Daytime summer land 24.92 Degrees celsius 2024 down 12.6% 1246th Land surface temperature - Cities and FUAs — Daytime winter land 4.74 Degrees celsius 2024 down 5.6% 917th Land surface temperature - Cities and FUAs — Daytime yearly land 17.42 Degrees celsius 2024 down 1.3% 1184th Land surface temperature - Cities and FUAs — Nighttime summer land 13.31 Degrees celsius 2024 down 2.5% 1123rd Land surface temperature - Cities and FUAs — Nighttime winter land 1.69 Degrees celsius 2024 up 259.3% 542nd Land surface temperature - Cities and FUAs — Nighttime yearly land 7.01 Degrees celsius 2024 down 1.9% 912th Air pollution - Cities and FUAs — Population exposure to nitrogen 42.64 Microgrammes per cubic metre 2025 — 347th Air pollution - Cities and FUAs — Population exposure to ozone 102.84 Microgrammes per cubic metre 2025 — 286th Air pollution - Cities and FUAs — Population exposure to PM10 39.96 Microgrammes per cubic metre 2025 — 566th Air pollution - Cities and FUAs — Population exposure to PM2.5 26.92 Microgrammes per cubic metre 2025 — 685th