Lawn equipment tends to have proportionally huge non-CO2 pollutant emissions because they are meant to be portable and thus have been exempted from emission standards. From what I've read, it seems like lawn equipment manufacturers do not consider pollution as a parameter when designing their equipment.

Electric lawn equipment has only become viable in the market in the past decade or so due to improved batteries. Now that electrification is feasible (and often nicer to use than gas-powered), seems great to ban or at least disincentivize combustion engine equipment.