Water pollution levels are lower in Tenerife than in Poland. In Tenerife, the small number of factories and natural wind patterns help remove polluted air, keeping pollution rates low according to official data. In contrast, Poland has highly contaminated areas with many factories and mines, especially in the Silesian Upland region, which has caused ecological disasters in local waters. The state of the Baltic Sea is also worrying due to biological and chemical imbalances in Poland's coastal zone, with the Vistula and Oder rivers introducing large amounts of pollution.