f881c3e3_Air_Alternatives__A_Fact_Sheet__Its_Sources
[Pollutant] Nitrogen Oxide [Health Effects] Impairs breathing, increases lung infections & worsens existing lung disease. [Its Sources] 
Combustion processes, such as in gas mowers, cars & power plants.
Cleaner Air: Mowing Emissions and Clean Air Alternatives. A Fact Sheet
Its Sources