Fine Particulate Matter (PM2.5)

Background

PM2.5 is defined as particulate matter with a diameter of less than 2.5 microns. this fine particulate matter is largely comprised of components of combustion and volatile organic compounds. Fine particulate matter is hazardous to human health since the body has difficulty expiring it since it penetrates the lungs so deeply. 

The National Ambient Air Quality Standards (NAAQs) for PM2.5, as of December 17, 2006: 

2 year average of the 98th percentile of the 24 hour averages below 35 micrograms per cubic meter. The annual arithmetic mean of 15.0  micrograms per cubic meter. 

ARAQMD has been monitoring for PM 2.5 since 1999 at 4 sites: East High School, Medina, Ravenna, and Five Points.

More in depth information about particulate matter is available through the EPA including basic information, health and welfare, standards, designations, implementation, regulatory actions, research, trends, sources, other resources.


Trends