Great responses so far pointing out that leaf blowers produce large amounts of particulates and smog forming hydrocarbons, but not large amounts of CO2. But no one has mentioned the main reason why- leaf blowers are generally two stroke engines. [They produce about twice as much power per pound as four stroke engines, but they exhaust a lot of partly burned fuel and even oil by design.](https://urbanemissions.blogspot.com/2009/12/2-stroke-vs-4-stroke-engines.html) This is way beyond the fact that they lack catalytic converters and pcv systems, it is inherently inefficient and dirty. Two stroke engines are restricted in most parts of the world for most purposes, but leaf blowers have to be light, so they’re exempt.
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