Shares of Dollar Tree Inc. /zigman2/quotes/203712248/composite DLTR -1.24% fell 1.0% in afternoon trading Friday, and the Canada-listed shares of Dollarama Inc. /zigman2/quotes/204887994/delayed CA:DOL -0.81% /zigman2/quotes/209375759/delayed DLMAF +1.69% slipped 0.4%, after Canada's Environment Defence announced this week a report that said heavy metals, such as lead, and other toxic chemicals were found in products sold at the discount retailers. The report from the environmental advocacy group revealed that phthalates, bisphenols, and PFAS (perfluoroalkyl and polyfluoroalkyl substances), also known as hazardous "forever chemicals," were present in a variety of food, toys, recess and daycare items. The organization also said it found a children's activity tracker and earbuds that had more than 8,000-times the external level of lead established for children's products. Dollar Tree and Dollarama did not immediately respond to a MarketWatch request for comment. "There is no safe limit on lead. Children's products should not contain this hazardous substance," said Cassie Barker, toxics senior program manager at Environmental Defence. "People living in Canada should not be poisoned by the products they purchase from discount stores, regardless of their socio-economic status."