San Francisco is on the verge of adopting a trailblazing law that would require cell phone stores to post the amount of radiation emitted by the devices they sell. The Board of Supervisors voted 10-1 to pass the measure, despite protests from the cell phone industry, and final approval is expected next week, the San Francisco Chronicle reports.

Under federal law, cell phone companies have to register the amount of radiation their phones emit with the FCC. The new rule would require retailers to post that measurement — called the “specific absorption rate” — in their stores in at least 11-point type.

San Francisco would be the first city in the nation to pass such an ordinance.

The proposal’s backers believe that the new rule will help consumers make informed choices, but John Walls, vice president of public affairs for the Cellular Telecommunications and Internet Association, told the Chronicle that “the ordinance will potentially mislead consumers with point-of-sale requirements suggesting that some phones are ‘safer’ than others.”

Mayor Gavin Newsom is expected to sign the ordinance after a 10-day comment period, the AP reports.