ABSTRACT
Gas-powered landscape equipment and tools incorporate one of two engine types. They are the two-stroke (or two-cycle) and the four-stroke (or four-cycle) engines. The major distinction pertains to the number of strokes of the piston involved in a working cycle. The four strokes are intake, compression, combustion, and exhaust. Two-stroke engines exhaust a high percentage of fuel as unburned hydrocarbons.
The California Air Resources Board (CARB) establishes emissions levels for the state, which are then often followed by other states and at the federal level.
Fugitive dust becomes airborne during the use of leaf blowers. It includes sidewalk and roadway dust, garden debris, leaves, and grass. Particulate matter is also airborne and includes bot solid and liquid particles.
A decibel is a measurement of sound. With total silence measuring a zero on the decibel scale, normal conversation is at 60 decibels, and 140 decibels is painful to the ear and causes immediate hearing loss.
E10 unleaded fuel started to become widely available in the 1990s, when states replaced MTBE (methyl tertiary-butyl-ether) with 10 percent ethanol as an enleanment additive or oxygenator.
