Leaf blowers are controversial due to their adverse impacts such as operator injury including hearing loss, particulates air pollution, noise pollution and ecological habitat destruction. Some units called blower vacs, can also suck in leaves and small twigs via a vacuum, and shred them into a bag. These are sometimes called "walk-behind leaf blowers" because they must be pushed by hand to be operated. Larger units may rest on wheels and even use a motor for propulsion. The latter is more ergonomic for prolonged use. Leaf blowers are typically self-contained handheld units, or backpack mounted units with a handheld wand. Gasoline models have traditionally been two-stroke engines, but four-stroke engines were recently introduced to partially address air pollution concerns. Leaf blowers are powered by electric or gasoline motors. A leaf blower, commonly known as a blower, is a gardening tool that propels air out of a nozzle to move debris such as leaves and grass cuttings.
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