Gasoline powered leaf blowers. I believe electric blowers are still permitted.
The issue with the electric ones is that those lawn care companies have crews that run leaf blowers all day long from one house to another. This is no longer possible as they take hours to recharge after each use. It works if each home owner buys a leaf blower of his own, but that's way less efficient from a manufacturing/maintenance perspective. We're just increasing inefficiencies.
There's some other sub-optimal options, but hopefully we don't see this energy-wasting noise-making cheapening out. They can charge them when they drive in most modern trucks (AC inverters are practically standard for work trucks). Worse, they start carrying around generators or idling their trucks; back to far more expensive (over time), polluting, and noisy. But both ought be better than a small screeching 2-stroke in terms of quality of life for the hundreds of people in the nearby area.
We're doing great. This is a huge improvement for quality of life for a huge huge number of people. For far more energy efficient & less costly over time systems, at modest investment cost. Particularly if you are a landscaper, having 6 sets of batteries that last 5+ years (and many many more if you're only cycling batteries once a day) seems like an incredibly minor investment cost.