Using "First World Problems" to describe this problem is not really helpful. It is inappropriate in this case because it is nothing more than a means to discredit and dismiss the problem at hand without any real debate - especially when you wrote nothing more than those 3 words.
First off, I would be surprised if leaf blowers were only used in the first world - they are no doubt more common there but I am sure they can be found throughout the world.
Secondly, the main victims of leaf-blowers are the people who operated them who suffer from the fumes and from hearing loss if they don't wear the appropriate equipment. Using FWP ignores the class dimensions to this problem.
Third, climate change is a whole world problem (although poorer countries will suffer disproportionately) so using inefficient engines to do IMO stupid stuff can definitely be discussed outside the context of FWP.