In Mariupol, the Donetsk Oblast Azov Sea port city of 450,000 people more than 800 kilometers southeast of Kyiv, a protest against air pollution from billionaire oligarch Rinat Akhmetov’s steel plants drew at least 3,000 people fed up with inhaling Ukraine’s dirtiest air.

“We want to breathe,” people chanted during the protest on Sept. 29.