It has become one of the most pressing issues in the region and there's no silver bullet to fix it.
The cause of the blast at the Russian-owned oil refinery was not immediately known.
Arsenic in the bedrocks has contaminated tap water in many cities in northern Serbia, as well as in Croatia and Hungary.
Meteoalarm issues "red warning" for 10 countries in a heatwave that has claimed the lives of two people and been nicknamed "Lucifer".
Firefighters in Croatia and Montenegro have been struggling to contain wild fires along the Adriatic coast as their counterparts in Italy, France and Portugal have been battling major blazes.
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