For weeks now, Cyrille Traoré Nbembi has been filming video after video of the black smoke coming out of an old foundry and factory located just a few metres from his home in Vindoulou, an area on the outskirts of Pointe-Noire, in Congo. As his family and neighbours continue to suffer health problems, Nbembi reached out to the FRANCE 24 Observers team – and is calling on the government to take action