California has an air-quality agency, the California Air Resources Board, that sets its own pollution rules, and it wanted to update its rules for commercial harbor craft such as tugboats, ferries, and fishing boats. Under the Clean Air Act, the federal Environmental Protection Agency, which enforces national pollution laws, can give California permission to enforce its own standards for engines in boats and other non-highway equipment, and it gave partial permission for these updates, which set new emission limits and deadlines based on vessel type and engine age and extend the rules to more vessels, including commercial fishing boats. This resolution uses Congress's power to cancel a federal agency decision, and it would cancel that permission, so California would not have federal approval to enforce those updated harbor craft amendments. The summary does not describe any other effects, such as what would happen to particular boat owners or to emissions.