6. UK
EPI: 79.89
CO2 emission:6.49
PM2.5: 12.1
Air pollution, as we have seen, is the worst in urban areas of course. Britain, the number 6 on our list of least polluted countries in the world in 2018 is not an exception to this either, having three-quarters of worst air pollution hotspots being in London. But it seems that levels of air pollution are getting slightly lower in recent times.
![Least Polluted Countries in the World in 2018](https://imonkey-blog.imgix.net/blog/wp-content/uploads/2015/05/shutterstock_102411556-750x500.jpg?auto=fortmat&fit=clip&expires=1770422400&width=480&height=320)
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