Accidental chemical pollution can have serious effects on human health. In 2006, the tanker vessel Probo Koala discharged hundreds of tons of toxic waste at many sites in Abidjan City, Ivory Coast. In the following days and weeks, thousands of people presented signs of poisoning. Analysis of the waste demonstrated the presence of toxic chemicals such as mercaptans and hydrogen sulfide. The final toll was 8 dead, dozens hospitalized, and about 100,000 seeking medical advice. This event provides evidence that, like international immigration, exportation of industrial waste can result in serious public health hazards.