WASHINGTON — Is anyone out there still listening?

The digital age is killing AM radio, an American institution that brought the nation fireside chats, Casey Kasem’s Top 40 and scratchy broadcasts of the World Series. Long surpassed by FM and more recently cast aside by satellite radio and Pandora, AM is now under siege from a new threat: rising interference from smartphones and consumer electronics that reduce many AM stations to little more than static. Its audience has sunk to historical lows.

But at least one man in Washington is tuning in.

Ajit Pai, the lone Republican on the Federal Communications Commission, is on a personal if quixotic quest to save AM. After a little more than a year in the job, he is urging the F.C.C. to undertake an overhaul of AM radio, which he calls “the audible core of our national culture.” He sees AM — largely the realm of local news, sports, conservative talk and religious broadcasters — as vital in emergencies and in rural areas.

“AM radio is localism, it is community,” Mr. Pai, 40, said in an interview.

AM’s longer wavelength means it can be heard at far greater distances and so in crises, he said, “AM radio is always going to be there.” As an example, he cited Fort Yukon, Alaska, where the AM station KZPA broadcasts inquiries about missing hunters and transmits flood alerts during the annual spring ice breakup.

“When the power goes out, when you can’t get a good cell signal, when the Internet goes down, people turn to battery-powered AM radios to get the information they need,” Mr. Pai said.