Several states sued the Environmental Protection Agency (EPA) on Wednesday over the agency’s decision to allow further use of a pesticide linked to brain damage.

California, New York, Massachusetts, Washington, Maryland and Vermont argued in court documents that chlorpyrifos, a common pesticide, should be banned due to the dangers associated with it.

Earthjustice filed a similar lawsuit in the 9th Circuit Court of Appeals on behalf of groups advocating for environmentalists, farmworkers and people with learning disabilities.

“A chlorpyrifos ban is long overdue given the overwhelming evidence that says this pesticide harms brain development in children,” Tracy Gregoire, a project coordinator at the Learning Disabilities Association of America, said in a statement. “We are hopeful the courts will side with children who are now being exposed to irreparable, yet preventable harm.”

Chlorpyrifos, known on the market as Lorsban, is used on a wide variety of crops, including corn and cranberries. Farmers have called it the last line of defense against certain insects.