The Noise Advisory Committee may be addressing this concern with some proposed modifications to the motion. However, that 90 decibals A (dBA) figure is almost certainly at the ear of the operator. To reach the threshold that is in the article now (78 dBA at 50 feet), a machine needs to exceed roughly 101 dBA at the ear, which is nearly 4 times as loud as 90 dBA.
With one exception, even the large gas powered leaf blowers we evaluated do not exceed 101 dBA at the ear. However, this is causing concern and confusion, so I hope that we will be able to simplify the article so as to remove any concerns about this. Our intent is to control leaf blowers, not other equipment.