Guam
Territory in Oceania
In brief
Air pollution PM2.5, µg/m³: 3.5 (2023). World rank 3 of 200 (1 = best); in Oceania, 2 of 17. CO₂ emissions, tonnes per person: 0 (2024). World rank 1 of 203 (1 = best); in Oceania, 1 of 19. All greenhouse gases, tonnes CO₂e per person: 0.1 (2024). World rank 2 of 203 (1 = best); in Oceania, 2 of 19. From 2015 to 2025: protected areas 0.1% → 0%.