Even if the police make an earnest attempt to do their jobs well (which is a pipe dream) coming to the scene of a lawn worker using a gas blower will be very low on their priority queue and is unlikely to happen most of the time.

If the homeowners don't like being fined and don't want to do the lawn work themselves, they can specifically hire lawn companies that use electric tools. You still haven't given me any reason why my proposal isn't a good one. The homeowners are the ones paying for these gas tools to be used, so they should be the ones fined for it.