WASHINGTON (Reuters) - President Barack Obama announced three nominees for his second term cabinet on Monday, choosing a philanthropy expert to run the White House budget office, an air quality expert to run the Environmental Protection Agency and a scientist to lead the Energy department.

Obama named Sylvia Mathews Burwell, head of the Walmart Foundation, to become director of the White House Office of Management and Budget.

He chose Gina McCarthy, currently the assistant administrator for the EPA Office of Air and Radiation, to become the agency's chief.

And he picked nuclear physicist Ernest Moniz to head the Department of Energy.

(Reporting by Jeff Mason; Editing by Vicki Allen)