SKC Limited EPAM-7500 - Manual (Page 60)

Appendix C
Appendix C Glossary of Terms
Term Definition/Standard
µ m Micron, 1/1000 of a meter.
ARD Arizona Road Dust
Inhalable Dust
Particulates Particulates having a 50% cut point at 100µm.
LPM Liters per minute.
mg/m
3
Milligrams per cubic meter.
NIOSH National Institute of Occupational Safety & Health
OSHA Occupational Safety & Health Administration.
Respirable Dust
Particulates Particulates having a 50% cut point at 3.5µm.
STEL Short-term exposure level. Maximum dust
concentration over a 15-minute period.
Thoracic Particulates Particulates having a 50% cut point at 10µm.
TWA Time Weighted Average. Average particulate
concentration over a period of time.