Mayor Bloomberg — who has already cracked down on smoking, junk food, trans fats, salt and super-sized drinks — is embarking on a new crusade: preventing New Yorkers from going deaf.

Hizzoner’s health officials are planning a social-media campaign to warn young people about the risk of losing their hearing from listening to music at high volume on personal MP3 players, The Post has learned.

“With public and private support, a public-education campaign is being developed to raise awareness about safe use of personal music players . . . and risks of loud and long listening,” said Nancy Clark, the city Health Department’s assistant commissioner of environmental-disease prevention.