–The Smith River is the wildest and cleanest river in the country outside of Alaska — indeed, it is one of the cleanest rivers in the world. — The Smith is the only major undammed river in California.
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For the cleanest water in Europe: The Lobau River, AustriaJust east of Vienna, the Lobau River runs through the Donau-Auen National Park.
For the cleanest water in Europe: The Lobau River, AustriaNearly 98 per cent of its bathing areas - where people regularly swim - were given an 'excellent' rating last year. While there are plenty of clear blue lakes to choose from, Austria also has rivers that are perfect for wild swimming.
Cleanest air in the world in 2022. The cleanest air in the world is in Zurich. The pollution status is determined on the basis of average levels of PM2. 5 measured over a period of 12 months.