To determine CO2, you can just look at the amount of fuel consumed. That'll get you close enough. A leaf-blower running for one hour will burn roughly 1/2 gal.

To determine CO2, you can just look at the amount of fuel consumed. That'll get you close enough. A leaf-blower running for one hour will burn roughly 1/2 gal. of fuel. A 40mpg car going from LA to Denver will burn about 25 gallons of fuel. That car trip will generate around 50 times as much CO2 as the blower