Abstract Dunaliella sp is one of primary producer that play an important role in food chain. Pb and Cd are non-essential heavy metals that are toxic to aquatic organisms. This study aimed to determine the toxicity of Pb and Cd on Dunaliella sp based on IC50, LOEC, and NOEC values and chlorophyll-a content after Pb and Cd in Dunaliella sp. The research was conducted in March-May 2022 at the Was…