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anses

French Agency for Food, Environmental and Occupational Health & Safety

Algae (green)

Green algae

Updated on 03/08/2016

Keywords : Algae (green), Chemical risks

Every summer for more than 30 years, massive quantities of green algae have been washing up on parts of the French coastline. Once washed up on beaches, these algae deposits decompose and produce large quantities of gases, especially hydrogen sulfide (H2S), potentially exposing walkers, local residents and workers required to collect these algae, to risks. The issue of the risks associated with these algae when bathing or consuming shellfish, as well as with regard to animal health, is also raised. 

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