ambient particulate matter
ambient air particulate matter
ambient particulate concentration
absorbable particulate matter
airborne particulate matter
airborne particulate matter APM
airborne suspended particulate matter
Atmospheric Particulate Matter
concentration of suspended particulate matter
Deposited particulate matter
dust particulate matter
fine particulate matter
grain-size of suspended particulate matter
Inhalable particulate matter
inhalable particulate matter PM10
inspiratory particulate matter
Moisture content in particulate matter