At the request of the Board or the Department, the Attorney General shall bring an action for an injunction against any person who violates any provision of this title or any order or permit issued by the Board or the Department under this title. In any action for an injunction under this section, any finding of the Board after a hearing is prima facie evidence of each fact the Board determines. On a showing that any person is violating or is about to violate any order or permit issued by the Board or the Department, a court shall grant an injunction without requiring a showing of a lack of an adequate remedy at law. If an emergency exists that creates imminent danger to the public health or welfare or the environment, the Attorney General at the request of the Board or the Department may institute a civil action for an immediate injunction to stop any pollution or other activity that is causing the danger.