In 2012, lead poisoning took the lives of more than 400 children living around a gold mine in Zamfara State, Nigeria.
The Nigerian government still has not released the $5m it promised in May 2012 to clean up the site.
It was thought that the lead had entered the children's bloodstreams from the soil or water contaminated by industrial paint.
Even tiny amounts of lead can devastate the nervous system and cause brain and blood disorders.
But Nigeria is not the only African country affected.
A 2011 survey conducted by the Centre de Recherche et d'Education pour le Développement (CREPD) revealed paints with concentrations exceeding 2,000 parts per million (ppm) in Cameroon.
Legal limits in the US are 90ppm for household paint.
"We cannot drag them [companies] to court because Cameroon lacks legislation limiting lead content in paint," says Samuel Tetsopgang, CREPD's coordinator.