EntityQ15187574· pop 8· linked from 10 articlesBlack TriangleSign in to savethe nickname for one of Europe's most polluted areas, where Germany, Poland and the Czech Republic meetConnectionsSan Francisco International Film FestivalEntityGermanEntityPolishEntitysilverEntitycopperEntityCzechEntitytinEntityleadEntityzincEntitySaxonyEntityuraniumEntitycobaltEntitynickelEntityThe New York TimesEntityBohemiaEntityacid rainEntityLower Silesian VoivodeshipEntityUpper SorbianEntityLower SorbianEntitysulfur dioxideEntityCategoriesAir pollution by regionBorder tripointsEnvironmentalism in GermanyEnvironment of PolandEnvironment of the Czech RepublicEurope articles missing geocoordinate dataGeography of LusatiaRegions of PolandRegions of SaxonyRegions of the Czech Republic