California has turned down the volume on obnoxiously loud streaming ads. Governor Gavin Newsom on Monday signed Senate Bill 576, a new law that bans streaming services such as Netflix and Hulu from playing advertisements that are substantially louder than the shows they accompany. The measure brings streaming platforms under the same noise limits already applied to television and cable broadcasters under the federal Commercial Advertisement Loudness Mitigation (CALM) Act, signed by President Barack Obama in 2010. That law, enforced by the Federal Communications Commission, requires that commercials maintain a consistent average volume with the programs they interrupt.

Streaming platforms were still emerging when the federal law passed, leaving them unregulated in this area. Congress has s

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