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Can you source this? I tried looking it up, and I found this
https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-209188
and
https://portal.311.nyc.gov/article/?kanumber=KA-01102
Which seem more concerned about how far away you can hear a vehicle from, rather than a specified decibel rating (But maybe that’s just a simpler way to measure decibel?)
It’s a way to assess dB without a gauge on hand.
https://www.roadandtrack.com/news/a60583398/nyc-noise-camera-loud-exhaust-case/