Black Triangle (region)
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The Black Triangle (Czech: Černý trojúhelník, German: Schwarzes Dreieck, Polish: Czarny trójkąt, Lower Sorbian: Carny tsirozk, Upper Sorbian: Čorny trirózk) is the border region between Germany, Poland and the Czech Republic, long characterized by extremely high levels of pollution. The term was coined in the 1980s.[1] For decades, industrially produced air pollutants (chiefly sulfur dioxide), water pollution, acid rain and other effects took an enormous toll on the health of local residents and the surrounding environment.[2]
After the Revolutions of 1989 in Eastern Europe, the three nations acted to cut emissions. This has resulted in significant environmental improvement.
In shape the "triangle" is more similar to a crescent, an industrial corridor roughly 60 kilometers wide, lying on either side of the northern Czech border extending from the German town of Bad Brambach on the west to the Polish town of Bystrzyca Kłodzka at the eastern end.[3]: 11 The approximate center is the national tripoint at Zittau. Politically the "triangle" consists of:[3]: 9
- Germany's two local administrative regions surrounding Dresden and Chemnitz, amounting to about 14,000 square kilometers, with a population of 3.36 million people (as of 2002)
- the southwest portion of Poland's Lower Silesian Voivodeship, amounting to 8,500 square kilometers, with a population of 1.3 million
- four regions of the Czech Republic (Hradec Králové, Karlovy Vary, Liberec and Ústí nad Labem), amounting to 12,000 square kilometers and a population of 1.59 million
The Polish portion includes the southernmost "salient" of the Gmina Bogatynia, where the vast Turów Coal Mine has extracted lignite resources since 1904.
The entire area is framed by mountain ranges which form a local climate, trapping air and intensifying the effects of the air pollution.[4]

