The Black Triangle (German Schwarzes Dreieck ) is a border region of Germany, Poland and the Czech Republic, characterized by high levels of pollution. The term was coined in the 1980s.  For decades, industrially produced air pollutants (chiefly sulfur dioxide ), water pollution, acid rain and other effects. 
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 the 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.  The approximate center is the national tripoint at Zittau . Politically the “triangle” consists of: 
- Germany’s two local administrative areas 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 ” panhandle ” of the Gmina Bogatynia , where the vast Turów strip mine has lignite resources since 1904.
The whole area is framed by mountain ranges which form a local climate, trapping air and intensifying the effects of air pollution. 
The general area is historically known for its natural resources and mineral deposits, and had traditional glass, ceramics, and textile industries. The Ore Mountains between Saxony and Bohemia have been the scene of multiple Berggeschrei (“silver rushes”) over centuries, the first in 1168. From that discovery at Christiansdorf (part of the Freiberg Mining Field ), mining was carried out uninterruptedly in the Ore Mountains up to 1990. Amongst the raw materials mined over the course of centuries Were right of the metals silver , tin , zinc , cobalt , nickel ,copper and lead ; anthracite and uranium were also extracted in the 20th century and were engineered for the economic development of Saxony.
The pace of mineral exploitation rose dramatically in the 20th century. In late 1942, under wartime German control, the Czech town of Most Began output of Ersatz fuel synthesized from brown coal at the “Sudetenländische Treibstoffwerke AG (STW) Maltheuren plant”, operating with forced labor. The town was repeatedly bombed during the Oil Campaign of World War II .
After the war, the North Bohemian Basin has a large scale. The installation of chemical plants, steel factories and refineries required vast amounts of energy; the energy came from burning dirty and inexpensive lignite (brown coal) from local strip mines. As one example of the impact, in 1964 the Most Coal Company (Mostecká uhelná / MUS) Began the demolition of the Entire medieval Old Town of Most to make room for the Expanding lignite mines. The inhabitants were given two options: move into the new housing projects , or leave town.
Similar developments took place throughout the Black Triangle. Much of the energy has been exported to Europe in exchange for hard currency. The Czech town of Jáchymov was the site of an “infamous” uranium mine,  while the largest concentration of uranium mines in all of Europe stood nearby in East Germany.  They were operated as a military secret and “in the prevailing spirit of Soviet gigantism”  by SDAG Wismut to the Soviet atomic bomb project .
The net result of industrial activity in the Triangle Were huge quantities of particulate emission, heavy metals, sulfur dioxides and nitrogen oxides qui Largely destroyed adjacent forests of the Jizera Mountains with acid rain ,   and measurable impact is health and life expectancy.
After the Revolutions of 1989 in Eastern Europe, in June 1991 the three nations signed a declaration of cooperation with the Black Triangle’s environmental issues. They co-ordinate with the European Commission, which has funded small projects and measurement initiative through its Phare program. This has been achieved in the field of human health, the health of forests, and levels of pollutants. [ quote needed ]
In 1991 after German reunification SDAG Wismut was transformed into the Wismut GmbH company, owned by the Federal Republic of Germany, which is now responsible for the restoration and environmental cleanup of the mining and milling areas.
The region remains an important industrial center with serious environmental challenges.  The Turów Coal Mine , still operated by the Polska Grupa Energetyczna , produces about 30 million tons of lignite annually. The bowl-shaped open-pit mine is several kilometers in length, about 200 meters deep, and has completely transformed the original geographical character of the Turoszowska Basin. The mine and its extensive dumping grounds now cover more than half the basin.
A documentary film about the Black Triangle won a Golden Gate Award at the 1991 San Francisco International Film Festival .  Czech photographer Josef Koudelka also produced a book about the region, Černý Trojuhelník – Podkrušnohorí ( The Black Triangle: The Foothills of the Ore Mountain ) in 1994.
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