Krakow, the polluted city

Kraków, is the second-largest and one of the oldest cities in Poland, was the official capital of Poland until 1596 and has traditionally been one of the leading centres of Polish academic, economic, cultural and artistic life There are about 40 parks in Kraków including dozens of gardens and forests, nevertheless, Kraków and its environment suffer from Europe's dirtiest air pollution because of smog, caused by burning coal for heating. (Original information is taken from wikipedia)