If you are going to ban one thing, why not just ban lawns ;-p
Although to support your point, “Quantification of the environmental and economic benefits of the electrification of lawn mowers on the US residential market”[1] abstract says “Gasoline-powered lawn mowers and garden equipment [in the USA are] accounting for a quarter of all non-road gasoline emissions.”.
[1] https://link.springer.com/article/10.1007/s11367-021-01917-x
I inherited a large lawn mower which I use for the overgrown uneven driveway. I could replace the mower with a weed whacker, however that would then take many hours longer (for a chore I really hate doing and do as little as possible!) I hate the noise but it works. An equivalent electric mower would be completely unaffordable for me.
I thought the majority of PM2.5 emissions was due to two-stroke engines?
The only two-stroke device I own is a chainsaw. I wanted to get a battery powered chainsaw, but they are at least 3 times the price. I also own a mains powered electric chainsaw, but an extension cord is frustrating, and only reasonable to use within tens of metres from a house.