Belarus is one of the most polluted countries in Europe due to the transboundary transport of pollutants.

The state of its air is defined by the external sources (81% for sulfur and 85% for nitric oxides).

Belarus itself is not a significant source of a transboundary air pollution by this group of pollutants.
The main sources of air pollution are emissions from vehicles, power installations and industrial enterprises.

According to the 2001 data, 70% (926 800 tons) of total emissions come from road transport, and 30% (392 100 tons) from stationary sources.