A Brooklyn lawsuit claims Walmart kept selling a store-brand air freshener after learning it carried dangerous levels of benzene. Maximus Pierre Ferraroni, a customer who bought the product at a Walmart in Centereach, filed suit in Kings County Supreme Court on Sept. He alleges the company continued stocking its Great Value Hawaiian Automatic Air Freshener Spray Refills despite documented evidence of a known carcinogen inside. 0094 parts per million — making the detected level roughly 117 times that threshold. The World Health Organization holds that no level of benzene exposure is without risk.