Puffs of yellowish grey-and-black smoke billowing out of household chimneys create a blanket of smog choking the southern Polish mining town of Rybnik, one of the most polluted places in the European Union.
Puffs of yellowish grey-and-black smoke billowing out of household chimneys create a blanket of smog choking the southern Polish mining town of Rybnik, one of the most polluted places in the European Union.