f881c3e3_Air_Alternatives__A_Fact_Sheet__Its_Sources
[Pollutant] Lead [Health Effects] Increased risk of harm to central nervous system, especially in children. [Its Sources] 
Smelters, battery plants & refineries; the exhaust of equipment that use leaded gasoline; lead-based paint or pottery.
Cleaner Air: Mowing Emissions and Clean Air Alternatives. A Fact Sheet
Its Sources