There is a reason combustion vehicles are mandated to have a catalytic converter, and why diesel vehicles must filter particulates.
https://phys.org/news/2014-05-two-stroke-scooters-super-poll...
Edit: For example, you’ll see where I asked my initial question here
I'm all for electrifying yard tools, but electric blowers still aren't anywhere near a high end Stihl or Husqvarna in performance.
Compare Table 3 to Table 5. PM emissions from exhaust are on the order of 1 gram per hour. Whereas fugitive dust emissions, depending on the surface, are 100s or 1000s of grams per hour.
There isn't a lot of data on how much the chemical makeup of particulates affects health, nor on what the makeup of particulates likely to be kicked up by a leaf-blower are. At least some of the particulates from two-stroke engine emissions are known to be really bad (e.g. partially combusted lubricants). So the jury is out on if the particulate related health risks are dominated by the engine or the dust. If you think "all PM2.5 is bad" then it's almost certainly dominated by the dust though.
1: https://ww2.arb.ca.gov/sites/default/files/2018-11/Health%20...