In this edition we head to Crimea, the Ukrainian region annexed by Russia in 2014. In recent weeks northern parts of the peninsula - along with some villages in mainland Ukraine - have been hit by toxic pollution, impacting the health of local people. Suspicions point to Europe's largest titanium dioxide factory, situated on the Crimean side of the border. Local authorities are downplaying the crisis, while Russian and Ukrainian officials trade blame. Our correspondents report.
A programme prepared by Patrick Lovett.