1. 
   PM-10-PM-2.5
   PM 10 is measure of particles in the atmosphere with a diameter of less than ten or equal to a nominal 10 micrometers. PM-2.5 is a measure of smaller particles in the air. PM-10 has been the pollutant particulate level standard against which EPA has been measuring Clean Air Act compliance. On the ba...
   Found op http://www.epa.gov/OCEPAterms/
   
   
2. 
   PM-2.5
   acronym: particulate matter of diameter less than 2.5 micrometers
   Found op http://cdiac.ornl.gov/pns/acronyms.html#P
   
   
3. 
   PM10/PM2.5
   PM10 is measure of particles in the atmosphere with a diameter of less than 10 or equal to a nominal 10 micrometers. PM2.5 is a measure of smaller particles in the air.
   Found op http://www.4cleanair.org/glossary.html
   
   

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