It is a signatory to the following environmentally relevant agreements and treaties Regional Aspects Concerns Poland's most serious regional environmental problems involve air and water pollution. Poland is both a source and a receiver of air pollution, while it stands out as a major source of water pollution. A critical tansboundary conservation challenge will be coordinating action to protect the Bialowieza forest , Europe's last pristine low-lying temperate forest. One third of the forest is in Poland, the remainder in Belarus.
Acid deposition is the greatest air pollution concern for Poland.
It receives large amounts of SOx from Germany and the Czech Republic and sends large amounts to the republics of the former Soviet Union. Poland is one of the European countries most affected by acid rain. The situation has improved since 1989, especially due to large emission reductions from eastern Germany. Eighty percent of NOx emissions come from foreign sources, again primarily from Germany and the Czech Republic. International water pollution problems mostly concern Poland's degradation of the Baltic Sea and the Oder River.