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The achievement of sustainable development of Bulgarian tourist resorts is questionable after the European Commission has put Bulgaria's two-month ultimatum to prove that it can deal with the problem of dirty air. Tourism is a sector that is accused of violating sustainable development due to its many negative environmental impacts. A significant part of the harmful impact is due to the transport used to reach the desired destination and the movement itself. Sustainable development is a keydoi:10.1051/e3sconf/201910101004 fatcat:aq6t6tgiq5cw3fqn2bjulwrvmy