Safety issues[edit]
Rotary mowers can throw out debris with extreme velocity and energy. Additionally, the blades of a self-powered push mower (gasoline or electric) can injure a careless or inattentive user; consequently, many come equipped with a
dead man's switch to immediately disable the blade rotation when the user is no longer holding the handle. In the United States, over 12,000 people per year are hospitalized as a result of lawn mower accidents.
[23] In 2016, 86,000 adults and 4,500 children were admitted to the emergency room for lawnmower injuries.
[24] The vast majority of these injuries can be prevented by wearing protective footwear when mowing.
[25] The
American Academy of Pediatrics recommends that children be at least 12 years old before they are allowed to use a walk-behind lawn mower and at least 16 years of age before using a riding mower and that they "should not operate lawn mowers until they have displayed the necessary levels of judgment, strength, coordination, and maturity".
[26] Persons using a mower should wear heavy footwear,
eye protection, and hearing protection in the case of engine-powered mowers.
Environmental and occupational impact[edit]

Noise level from a lawn mower measured using the NIOSH
Sound Level Meter app
[27]
A 2001 study showed that some mowers produce the same amount of pollution (emissions other than
carbon dioxide) in one hour as driving a 1992 model vehicle for 650 miles (1,050 km).
[28] Another estimate puts the amount of pollution from a lawn mower at four times the amount from a car, per hour, although this report is no longer available.
[29] Beginning in 2011, the
United States Environmental Protection Agency set standards for lawn equipment emissions and expects a reduction of at least 35 percent.
[30]
Gas powered lawn mowers produce GHG emissions. A minimum-maintained lawn management practice with clipping recycling, and minimum irrigation and mowing, is recommended to mitigate global warming effects from urban turfgrass system.
[31]
Battery-powered lawn mowers offer cleaner alternatives to consumers by producing zero emissions, being more efficient, and eliminating risks of spilled gasoline.
[32] Gas powered lawnmowers are not regulated to have emission-capturing technology.
[32]
Mowers can create significant
noise pollution,
[33][34] and could cause hearing loss if used without hearing protection for prolonged periods of time.
[35] Lawn mowers also present an occupational hearing hazard to the nearly 1 million people who work in lawn service and ground-keeping.
[36] One study assessed the occupational noise exposure among groundskeepers at several North Carolina public universities and found
noise levels from push lawn mowers measured between 86 and 95 decibels (A-weighted) and from riding lawn mowers between 88 and 96 dB(A); both types exceeded the National Institute for Occupational Safety and Health (
NIOSH) Recommended Exposure Limit of 85 dB(A).
[37]
The risk of hearing loss and noise pollution can be reduced by using battery-operated mowers or appropriate
hearing protection such as
earplugs or
earmuffs.
It is possible for a lawn mower to damage the underlying soil, the roots of the grass, and the mower itself if the blades cut through the grass and collide with the underlying ground. Therefore, it is important to adjust mower height properly and choose the right tires for a lawn mower to prevent any marking or digging.