Tag Archive: Dr. Jamie Banks

Low Frequency Noise May Account for the Intolerability of Gas Leaf Blowers

Photo credit: Dean Hochman licensed under CC BY 2.0

by Jamie Banks, PhD, and Erica Walker, PhD

Boston, MA —Complaints by many residents over commercial gas leaf blower use may be explained by a strong low frequency component, according to a pilot study conducted by researchers. The study found low frequency noise from commercial gas leaf blowers persisted at high levels for 800 feet from the source. Low frequency sound travels over long distances and penetrates walls and windows. “Our finding helps explain why so many people are complaining about the effects this noise is having on their health and quality of life,” said Jamie Banks of Quiet Communities and co-author of the study. “At these levels, operating even one gas leaf blower can affect an entire neighborhood.”

Loud noise is known to harm hearing and non-hearing health, causing cardiovascular disturbances, psychological distress, and disruptions to learning and concentration. Vulnerable populations include landscape workers, children, senior, and people with hearing and neurological disorders, such as autism. More than 100 million people in the US are estimated to be exposed to harmful levels of environmental noise.

The study appears online Nov 3, 2017 in the Journal of Environmental and Toxicological Studies. It is the first in the U.S. to explore the characteristics of sound from gas-powered lawn and garden equipment.

Sound from leaf blowers and a hose vacuum—equipment commonly used in landscape maintenance—was over 100 dbA at the source and decreased over distance. However, the low frequency component persisted at high levels. “From a community perspective, the sound ratings supplied by manufacturers do not take frequency into consideration,” said co-author Erica Walker, a recent graduate of the doctoral program at the Harvard T.H. Chan School of Public Health. “Our findings suggest that reporting more information on a sound’s character may be a step in the right direction,” she adds.

A Finnish study presented in 2004 also found strong tonal and low frequency components among various brands of commercial gas leaf blowers. These are the types of sound poorly tolerated by humans and which become amplified in indoor settings.

The dB(A) is the standard used by manufacturers to rate the sound of their equipment and is the metric communities use to set regulatory policy. “We now know that this metric breaks down in instances where there is a significant low frequency noise component,” said Walker. In fact, in the International Institute for Noise Control Engineering and the National Academy of Engineering have both indicated that the dB(A) is not sufficient for describing the impact of sound that contains a strong low frequency component.

Gas leaf blowers are identified as sources of harmful noise by the US Centers for Disease Control, US EPA as well as the national landscape industry association. “People need to recognize that this type of noise is not just an annoyance, it is a public health problem. We need think about prevention,” said Banks.

For more information:

Jamie Banks: jlbanks@quietcommunities.org

Erica Walker: erica@noiseandthecity.org

Originally posted at Quiet Communities.

Noise isn’t just a city problem

On Banning Leaf Blowers.” Kaysen writes that “New Yorkers who leave the city for the suburbs often do so for three reasons: schools, space and silence.” But she adds that “silence, it turns out, can be a problem.” Why? Because while “suburban streets are certainly free of blaring horns, wailing sirens and, sometimes, even people…come springtime, they vibrate with the hum of lawn mowers, edgers, trimmers and leaf blowers; the accompanying noise continues until the last leaves fall from the trees in early December.”

So what can suburbanites do to quell the din?  Kaysen tells us that the Township of Maplewood, New Jersey is considering a ban on the noisiest and most noxious of a landscaper’s tools: leaf blowers. The township’s proposed ordinance prohibits commercial use of blowers from May 15 through September 30, and imposes strict limits as to use for the rest of the year. The ordinance also imposes fines, starting at $500 for the first offense.

The problem with leaf blowers is twofold. As Jamie Banks, the founder of Quiet Communities, a group that advocates quieter lawn maintenance equipment, states: “[I]t’s not just the noise. It’s the pollution.”  Kaysen adds that:

Most landscapers use leaf blowers with two-stroke engines, which are light enough to carry but produce significant exhaust and noise. The gas and oil mix together, and about a third of it does not combust. As a result, pollutants that have been linked to cancers, heart disease, asthma and other serious ailments escape into the air.

Despite there being alternatives–say, a rake?–there is pushback, of course. Residents who hate noise are facing off with residents who feel the ordinance will “hamstrung their gardeners, leaving their yards looking unkempt, with grass suffocating beneath piles of clippings.”  And landscapers insist that leaf blowers are essential, claiming that “when used properly, is not a nuisance.”  Used properly means at half speed, “which is significantly lower in noise volume, they’re much more efficient,” said Paul Mendelsohn, vice president of government relations for the National Association of Landscape Professionals.  Which makes us wonder why full speed is even an option.

Click the first link to read the entire piece.  It is well worth your time, particularly the bit about local hero Fred Chichester, 79, of Montclair, who, when he hears a leaf blower nearby, “gets into his 1998 Ford Escort wagon, one of his seven cars, and looks for the culprits, suing them in municipal court for violating the ban.” Fred then takes the landscapers to court, “about 20 times over the years.” And he usually wins.