Table 1. Hierarchy of control measures for airborne contaminants in the work environment in order of priority (top to bottom) and in order of preference (left to right).
Control measure | Agent | Process/appliance | Working environment | Work practice |
Elimination | Total substitution | Different process | Layout change | Automation, robotisation, remote control |
Reduction | Partial substitution, change of form | Adjustment, preventive maintenance, specialised appliance |
Good housekeeping | Correct work procedures, training, instruction, motivation, supervision |
Isolation | Enclosure segregation | Glove box, safety cabinet, segregation, high-exposure departments | Ensuring enclosure | |
Ventilation | Local exhaust ventilation, push/pull ventilation | Dilution ventilation, air douches, air curtains | Portable jets, low-volume, high-velocity tools | |
Exposure avoidance | Booths for operators | Shorter shifts, fewer people, work schedules | ||
Personal protection | Respiratory protection, gloves, clothing |