San Francisco controversial new law requiring cell phone retailers in the City to provide radiation information is now live.

The ordinance requires cell phone retailers to display information about the amount of radiation emanating from cell phones and to provide fact sheets to customers who ask for them.

The law has been discussed and debated in the City for almost two years with former San Francisco mayor and now Lt. Gov. Gavin Newsom pushing its adoption.

There is some controversy about how radiation levels are measured and whether cell phone radiation poses an immediate threat at all.

Regardless, the new law gives retailers until the end of the month to comply.