Verify workers’ exposure with sampling, analytical analysis, or objective data
Did you know employers need to verify their workers’ exposure levels to respiratory hazards? Employers often forget to do this! Once you’ve estimated the exposure, you must select one of three methods to verify your workers’ exposure. These are sampling, mathematical computation, or using objective data.
This reasonable estimate isn’t an educated guess, either. Look at the details of the work activity, chemicals used, application method, ventilation, containments, and other variables that would affect your workers’ respiratory exposure. This article provides guidance to employers how to verify their workers’ estimated exposure levels to respiratory hazards.
Guidance from OSHA
OSHA 1910.134, Respiratory protection, requires employers to estimate their workers’ exposure to respiratory hazards reasonably. But it also states, “[w]here the employer cannot identify or reasonably estimate the employee exposure, the employer shall consider the atmosphere to be [immediately dangerous to life and health (IDLH)].”
If you need to treat the workspace as IDLH, workers will need to wear respiratory devices with a higher assigned protection factor (APF). This may lead to extra expense in unnecessary equipment and increased stress and discomfort on workers because they must wear additional personal protective equipment.
If OSHA inspects your workplace, compliance officers generally ask how your workers’ respiratory estimate was performed and how it was verified. If an employer cannot provide this information, it may result in the employer receiving a citation and penalties. For example, on March 6, 2023, OSHA cited an employer for failing to have an effective respiratory protection program. Workers became sick after having exposure to toxic metal fumes above OSHA’s permissible exposure limit. This employer is facing $195,988 in proposed penalties. An effective assessment and verification of respiratory exposures could have avoided workers’ overexposure to the toxic fumes.
Verifying your reasonable estimate of exposure
Sampling is the easiest way to verify exposure levels. A sampling pump draws air through a cassette that collects air contaminants. The cassette is sent to a laboratory for analytical analysis. The lab then reports the results to the employer, who determines workers’ exposure levels. The cost of the equipment, training someone to use it, lab fees, wearing a pump for 7-8 hours, and understanding how and when to change out cassettes are some hurdles that need to be addressed if using this option.
Employers can also use objective data to verify exposure levels, but it can be challenging. Using objective data requires comparing past work (usually within the past 12 months) with the current scope. The work scopes, workers’ training, supervision, containment, ventilation, and other controls must be exact. Unless the work activities and related safety resources were set up to be exact, using objective data may not be an easy option.
The final option is having a qualified person perform math computations to determine workers’ exposure levels. A professional engineer, a safety professional, or a certified industrial hygienist could do this. You need to provide them with specific information such as work area dimensions, ventilation information, number of workers, safety and product data sheets for chemicals being used, and application methods. This information isn’t always readily available in the early work planning stages before actual work activity begins.
Key to remember
After performing a reasonable estimate of your workers’ exposure to airborne contaminants, verify their exposure by sampling, math computation, or using objective data.