Baltic sea - one of the most polluted places in the World

According to this article, the Baltic sea is one of the most polluted places in the World. Apparently in 1947 the WWII chemical weapons were dumped there - around 40 tonnes of them. It is claimed that the casings have rusted through, and people started noticing the effects on sea life in the last decade or so. Apparently Lithuania is not as affected as for example areas next to Bornholm/Denmark or Liepaja/Latvia. Still - there is plenty of reasons to get worried ...