11. Norway
Some parts of Norway have very clean air, even though here we will stick to the country’s numbers in general. Next winter, maybe you should try visiting some of its sky centers. So let’s check its air – the median concentration of PM2.5 is 9, the death rate is 13 per 100,000 capita, and it has a population of 5,305,383 citizens.
Vlada Z/Shutterstock.com
