HISTORICAL EVENTS
{"Image DocumentName": "HISTORICAL EVENTS", "Image ImageDescription": "In 1993, revisions to Appendix D of the ACGIH TLV booklet, Particle Size-Selective Sampling Criteria for Airborne Particulate Matter were adopted by ACGIH. Three particulate mass fractions were defined: inhalable, thoracic and respirable.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}