"Gasoline-powered lawn and garden equipment (GLGE) ranging from string trimmers to stump grinders and tractors is a source of high levels of localized emissions that includes hazardous air pollutants, criteria pollutants, and carbon dioxide (CO2).  Workers using commercial equipment are exposed when they are close to the emitting sources several hours each day, several days a week in seasons of use.  Other members of the public, including children, may also be exposed to high levels of emissions from commercial landscape maintenance equipment (GLME) such as leaf blowers, trimmers, and mowers, used routinely around residential neighborhoods, schools, parks, and other public spaces." 

Banks, J. L., & McConnell, R. (n.d.). National Emissions from lawn and garden equipment - EPA.Gov . Retrieved May 27, 2022, from https://www.epa.gov/sites/default/files/2015-09/documents/banks.pdf