shall determine whether a hypoxia or harmful algal bloom event is an event of national significance. (2) Considerations In making a determination under paragraph (1), the appropriate Federal official shall consider such factors as the toxicity of the hypoxia or harmful algal bloom, its potential to spread, the economic impact, and the geographic scope, including the potential to affect several municipalities, to affect more than 1 State, or to cross an international boundary. (c) Definitions In this section: (1) Appropriate Federal official The term appropriate Federal official means— (A) in the case of a marine or coastal hypoxia or harmful algal bloom event, the Under Secretary of Commerce for Oceans and Atmosphere