According to the EPA, emissions from landscape equipment (mowers, blowers, trimmers, etc.) can be greater than those from a car, per hour of operation. Small gasoline-powered two-cycle engines are the most polluting.
Here are some ideas for keeping pollution from landscaping equipment to a minimum:
Mandate your town's purchase of electric landscaping equipment whenever possible, including mowers, blowers and
sweepers. Electric landscaping tools create no pollution, are easy to start, lightweight and often have features such as "grasscycling" for mowers that chop clippings into compostable bits.
Keep all motorized equipment in top working condition, replacing oil and air filters regularly, getting periodic tune-ups and keeping blades sharp.
Avoid gasoline and motor oil spills. Even small gas spills volatilize into the air and create pollution, while oil spills run off into surface waters, polluting these fragile eco-systems.
Southampton, NY became the first Green Zone® on the east coast in 2016 by using only electric-powered maintenance equipment in a town-owned park to reduce noise levels and eliminate carbon emissions and toxic pollutants.
Quiet Communities (QC) is an independent non-profit organization with a mission to transition landscape maintenance to low noise, zero emissions practices with positive solutions to protect the health of workers, the public and the environment.
The Love ‘Em and Leave ‘Em initiative provides training, marketing, and a policy campaign for on-site grass and leaf mulching to help municipalities save money, time and labor.
 Banks, J. L., PhD, MS, & McConnell, R. (2018). National Emissions from Lawn and Garden Equipment. https://www.epa.gov/sites/production/files/2015-09/documents/banks.pdf
 Ecological landscape Alliance. (2015) Can Electric Equipment Revolutionize Landscape Maintenance? https://www.ecolandscaping.org/05/sustainability/can-electric-equipment-revolutionize-landscape-maintenance/
 Chaplin, B., et al. (2002). Long-Term Evolution of Biodegradation and Volatilization Rakes in a Crude Oil-Contaminated Aquifer. Bioremediation Journal, 6(3), 237-255.