The U.S. Environmental Protection Agency (EPA) is working to meet Clean Air Act deadlines to review, revise and implement national ambient air quality standards (NAAQS) – with nitrogen oxides and ozone at the forefront of recent actions. President Trump recently issued a memo that directs the Agency and EPA Administrator Scott Pruitt to take a series of “actions” to facilitate state and industry compliance with NAAQS and reduce barriers to economic growth. This includes decisions for the air permits needed to construct new facilities or to expand or modernize existing facilities. The memo notes that these air construction permits have become increasingly difficult to obtain as NAAQS have become more stringent. The White House said in a press release that the “Administration will reform NAAQS implementation to provide States with a more efficient process and to promote economic growth."