Ozone monitoring is recognized as an industry concern and is addressed by manufacturers of ozone systems. The Occupational Safety and Health Administration (OSHA) regulates employee exposure to ozone gas through its Air Contaminants Standard 29 CFR 1910.1000. The permissible exposure limit is listed as an eight-hour, time-weighted average value of 0.1 part of ozone per million parts of air (ppm). Other regulatory agencies, such as the Food and Drug Administration (FDA), have set safe levels at 0.05 ppm for continual exposure—see 21 CFR 801.415 Maximum acceptable level of ozone.
In the past, ozone generators had the potential to produce ozone levels that exceeded these recommendations. To combat this problem, some manufacturers have introduced models with ozone sensors that automatically shut off the units when ozone levels rise above a set limit.
Ozone tends to smell like the air after a rainstorm and dangerous levels may not be easily detectable by personnel in the vicinity of the ozone laundry system. Wall-mounted or portable ozone monitoring systems are available to help detect the presence of ozone. Wall-mounted systems have the advantage of being constantly on and sensing the atmosphere. Most wall-mounted systems also have an auto-test button to assure that the sensing device is operating properly. Portable battery-operated systems are less expensive, but the user must remember to periodically test the laundry environment and to have the instrument recalibrated on a regular basis.
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