A leaf blower is gardening tool that propels air out of a nozzle to move yard debris such as leaves. Leaf blowers are usually powered by two-stroke engine or an electric motor, but four-stroke engines were recently introduced to partially address air pollution concerns. Leaf blowers are typically self contained handheld units, or backpack mounted units with a handheld wand. The latter is more ergonomic for prolonged use. Some units can also suck in leaves and small twigs via a vacuum, and shred them into a bag. The leaf blower was invented by Dom Quinto in the late 1950s. It was originally introduced to the United States as part of an agricultural chemical sprayer. Shortly thereafter manufacturers discovered that many consumers were removing the chemical dispensing parts from the device, leaving only the blower behind. Manufacturers then saw the potential of their invention as a common lawn and garden maintenance tool. Drought conditions in California facilitated acceptance of the leaf blower as the use of water for many garden clean-up tasks was prohibited. By 1990, annual sales were over 800000 in the US, and the tool had become a ubiquitous gardening implement.
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