Tallinn- the capital city of Estonia.
"In recent days, Beijing, Hebei, Shandong, Henan and Jiangxi have suffered very serious air pollution and Beijing is choked in the densest smog than ever. Many residents have closed windows and doors to avoid breathing the polluted air. The government also asks the citizens to stay home and wear masks when going out.
In 2012, the World Health Organization issued a global air quality ranking and Estonia, Mauritius and Canada rank the top three. According to statistics, these countries are benefited from their low population density, superior climate conditions and strict control measures on air pollution.
Top 1 Estonia
Estonia lies on the eastern shores of the Baltic Sea. Its capital is Tallinn. According to the global air quality ranking issued by the WHO, Estonia enjoys the cleanest air in the world. Estonia, with 47 percent of its territory covered by forests, has numerous fantastic gulfs, straits, islands, lakes and marshes.
Because of its outstanding air quality, Estonia attracts many health-minded tourists from all over the world."
People's Daily Online, http://english.people.com.cn/90777/8091863.html