Australia Model Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace 3.3c: 3.3 Estimate exposure and monitor air properly, keeping records for 30 years

Exposure can be estimated from the quantities used, frequency and duration, effectiveness of controls and whether workers work directly with the substance, using personal sampling for inhalation exposure, static area sampling (useful for airborne levels but not acceptable to show compliance with exposure standards), air monitoring by a person with skills such as an occupational hygienist working to the appropriate standard, observation of deposits, dust, mist or odours, and simple tests such as indicator tubes or dust lamps that may not show exposure with confidence because levels vary through the day. For chemicals presenting a significant hazard consider air monitoring. Records of air monitoring for airborne contaminants with exposure standards must be kept for at least 30 years and be available to exposed workers.