A garbage incineration plant reportedly owned by the son of Russia’s attorney general has been filmed spewing purple smoke on the eastern outskirts of Moscow for at least the third time in as many years.

Activists seeking to shut down the MSZ-4 plant have long complained about its bad odor and adverse environmental impact. The plant, said to be majority-owned by the Russian prosecutor general’s youngest son, Igor Chaika, burns over a quarter million tons of solid waste per year.