f881c3e3_Air_Alternatives__A_Fact_Sheet__Its_Sources
[Pollutant] Particulate matter [Health Effects] Irritates lungs' pathways which can increase respiratory infection & asthma attacks & worsen disease. [Its Sources] 
Dust, pollen, soot & other small particles suspended in the air.
Cleaner Air: Mowing Emissions and Clean Air Alternatives. A Fact Sheet
Its Sources