Terms TSP: Total suspended particulate matter RSP: Respirable suspended particulate matter PM10: Particulate matter of less than 10 um equivalent to RSP. PM25: Particulate matter of less than 25 umTerms • TSP: Total suspended particulate matter • RSP: Respirable suspended particulate matter • PM10: Particulate matter of less than 10 um; equivalent to RSP. • PM2.5: Particulate matter of less than 2.5 um