Gas/petrol leaf-blowers are bio-hazards.
Usually 2-stroke, they vent about 30% unburnt fuel into air around user, emit orders of magnitude more pollution than a truck:
https://www.edmunds.com/car-reviews/features/emissions-test-car-vs-truck-vs-leaf-blower.html
Per others’ comments, maybe a role for some people for *electric* blowers to clear some hardscapes, but they shouldn’t be used on other ground surfaces — usually powerful enough to lift the topsoil, fungus, spores etc. high into the air, ruining garden and causing pulmonary problems.
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