If you needed scientific reasons to hate leaf blowers: here you go: https://www.theatlantic.com/notes/2016/01/leafblower-legislation-local-press/424533/?s=09 [https://www.theatlantic.com/notes/2016/01/leafblower-legislation-local-press/424533/?s=09]

»running a leafblower for 30 minutes creates more emissions than driving a F-150 pickup truck 3800 miles. About one-third of the gasoline that goes into this sort of engine is spewed out, unburned, in an aerosol mixed with oil in the exhaust.«