City-by-the-bay’s new cellphone law

San Francisco has passed a new law requiring retailers to post information warning customers about the risks of exposing themselves to radiation as a result of cellphone use.

The ordinance—the first of its kind in the U.S.—takes effect at the end of October, according to media sources. It mandates retailers display informational posters in their stores explaining the potential danger of cellphone radiation and how to reduce the risk of exposure. Some of the suggestions include using a headset or speaker phone, texting in lieu of making calls and limiting children’s use of mobile phones.

Several studies linking cellphone use to cancer were reviewed by the International Agency for Research on Cancer, leading the organization to classify cellphones as possibly carcinogenic.