Bulgarian capital of Sofia, one of Europe's most polluted capitals for 2019

Bulgarian flag is seen waving during protest of the medical workers in front the building of the Ministry of Interior of Bulgaria, Prime Minister is Boyko Borissov. Bulgarian capital of Sofia, one of Europe's most polluted capitals for 2019. is the capital and largest city of Bulgaria. The city is at the foot of Vitosha Mountain in the western part of the country. Being in the centre of the Balkans. Being Bulgaria's primate city, Sofia is a hometown of many of the major local universities, cultural institutions and commercial companies.Sofia is one of the top 10 best places for start-up businesses in the world, especially in information technologies. Sofia hosts some 1.23 million residents, Sofia, Bulgaria on December 17, 2019