A common pesticide ingredient no longer needs safety limits

US environmental regulators have removed the requirement for safety limits on potassium polyaspartate, an ingredient in some pesticides. This means pesticide makers can use it without proving it is safe at specific levels.

For years, any ingredient in a pesticide had to have a "tolerance," a maximum amount allowed on food. This rule change means one specific ingredient, potassium polyaspartate, can be used without that limit. It makes it easier and cheaper for companies to use this chemical in their products.