Nis and Valjevo
"5 of Europe's 10 most polluted cities are in Balkans"
According to the agency, the only ones who are happy are vendors of air purifiers.
According to the World Health Organization (WHO), on the list of the ten most polluted cities in Europe, five are in the Balkans, and they are Bosnia-Herzegovina), Pljevlja (Montenegro) and Skopje, Tetovo and Bitola (Macedonia).