10 cleanest countries in the world that are leading by example

Cleanliness is a way of life, which directly impacts health and longevity. High air quality reduces risks of respiratory and cardiovascular diseases, while safe drinking water and proper sanitation keeps deadly infections at bay. But scaling these standards across an entire nation is no small feat. That’s where the Environmental Performance Index (EPI) steps in. Developed by Yale and Columbia Universities in partnership with the World Economic Forum, the 2024 EPI evaluates 58 indicators across 11 categories, from air quality and waste management to biodiversity and climate action. The outcome is a comprehensive score that highlights which countries are leading the way in safeguarding both the planet and human well-being.
So, which nations top the charts? Here are the 10 cleanest countries in the world as per the latest data available in World Population Review.

Estonia, a Baltic gem, leads the world in cleanliness and ranks among the most eco-friendly nations. It excels in renewable energy, sustainable forestry, and carbon-neutral public transport. With top-notch air quality and ecosystem health, Estonia proves smart planning yields remarkable environmental results.

Luxembourg secures second position and punches above its weight in water management and biodiversity protection. It’s small but might, with more than 55% of its land safeguarded. Also, its near-perfect sanitation and drinking water scores, makes this European gem prove that size doesn’t limit environmental ambition.

Germany comes in third, where it has shown strong leadership in both green policies, and actions to implement them. The country skillfully treats 100% of its urban wastewater, and scores high in biodiversity. It continues to lead Europe in sustainable infrastructure, and showcases an ideal mix of innovation and conservation.

Nature is central to Finnish culture, and that shows in its EPI performance. Finland earns perfect scores in sanitation and heavy metals control while keeping its forests and air clean. It’s no surprise that this Nordic country consistently ranks among the world’s greenest.

The UK has made huge strides in conservation and emission reduction. It’s also the only country in the index to designate marine protected areas across more than 30% of its ocean territory. A nearly 30% cut in greenhouse gas emissions over the last decade further cements its place in the top five.

Renowned for its eco-conscious lifestyle, Sweden excels in sanitation, drinking water, and air quality. Its reliance on renewable energy and well-managed forests ensure that this Scandinavian nation continues to lead on sustainability.

Norway is famous for its fjords, but it’s also a champion of clean living. With 100% renewable electricity and top marks in heavy metals management, Norway is setting benchmarks for sustainable energy use while keeping its skies clean.

Known for its strict pollution standards, Austria ensures clean air, water, and waste management. About two-thirds of the country is covered in forests and meadows, making it not just one of the cleanest but also one of the most picturesque.

Switzerland's popularity is not only limited to its beautiful landscape, crystal-clear lakes, or the scenic Alps, as the country’s perfect scores in drinking water and sanitation indicate how environmental care and public health are also its priority. Further, its pristine wildlife habitats and strong pollution control, make it one of the cleanest alpine nations in the world.

Denmark rounds off the list with innovation-driven sustainability. While its pace of emissions reduction has slowed, the country still leads with eco-friendly hotels, organic food, and renewable energy projects, proving that green living is deeply ingrained in its culture and everyday lifestyle.