Index ranks 180 countries on 24 performance indicators across ten issue categories covering environmental health and ecosystem vitality:
- Environmental Protection.
- Environmental Health (Air Quality, Water & Sanitation, Heavy Metals / Lead Exposure).
- Ecosystem Vitality (Biodiversity & Habitat, Forests / Tree Cover Loss, Fisheries, Climate & Energy, Air Pollution, Water Resources / Wastewater Treatment, Agriculture / Sustainable Nitrogen Management).
At the top of the rankings, Switzerland leads the world in the 2018 EPI
with a score of 87.42 in overall environmental performance. Switzerland's top ranking reflects strong performance across most issues, especially Climate & Energy and Air Pollution. Within Environmental Health, Switzerland also stands out in Water & Sanitation. This confirms the high Swiss quality of raw materials and product.