Sanding taped and covered plasterboard joints can produce high levels of gypsum dust. Falls and trips in construction 2007-2010Ĭonstruction dust: Sanding taped and covered plasterboard joints.Controlling physical ill health risks - Key points.Controlling physical ill health risks overview.Controlling hazardous substances - Key points.Controlling hazardous substances overview.Perform job tasks near the same emission source.ĭepending on the substances being monitored, workers may fall into more than one SEG. Perform their tasks using the same procedures. Use the same materials or processes to complete tasks. Perform similar types of tasks at a similar frequency. To form SEG's in your workplace look for workers who: Workers may be readily categorised by job task or job description, process, craft, exposure to a specific substance, or the control measures available to them. You need to use your judgement when deciding on sample size, especially when small groups are concerned.įor worst-case monitoring, as a rule of thumb, at least one employee in five needs to be monitored from a properly selected similar exposure group (SEG), unless a smaller number can be justified.Ī SEG is a group of workers whose exposure profile is similar enough to be characterised by a representative set of samples. In reality the number of samples that you can take is usually constrained by the resources available to you. Taking one or a few samples on one day will not provide you with sufficient information on which to base conclusions about long-term exposures. This form of sampling can not be used to compare exposures against legal exposure limits.Ĭlose to sources of emission in order to evaluate concentrations or the standard of engineering controls Īt various places in the working area to assess the extent of the substances general distribution andįrom working areas which represent typical exposure. If static monitoring is carried out it should only be used to determine the distribution of airborne substances throughout the general atmosphere of the working area and to identify problems and priorities. The measurement may be continuous over the whole shift or intermittent, so long as this allows a valid calculation of the average exposure and where necessary is supplemented by short-term sampling during periods of peak emission.Įxposure profiles of particular jobs or occupational categories should be constructed from the air-sampling data of different operations and from the workers' exposure time in these jobs. The exposure should be compared to legal exposure limit values, which are usually quoted for an eight-hour period or, for short-term limits, 15 minutes. Personal sampling should measure exposure, or allow assessment of exposure throughout the work shift. Where concentrations vary from one work operation or phase to another, personal sampling should be done in such a manner that the averages and in any case the maximum, level of exposure of each individual worker can be determined. Sampling should be carried out while the work activity is in operation. Air samples should be collected in the workers breathing zone by means of personal samplers. Personal monitoring should be used to evaluate the risk of exposure to the individual worker. The frequency will vary and should depend on how close the measured exposure is to the workplace exposure limit, significant or highly significant exposure scenarios should be measured more frequently.Ī regular monitoring program is required for the following reasons: How Often Should Monitoring Be Carried Out?īecause of variations in plant, process, work and other conditions it is difficult to draw conclusions about long-term exposure patterns on the basis of a single measurement of exposure at one point in time.Įxposure monitoring should be carried out on at least an annual basis depending on the risk identified from your initial assessments. Measurements of airborne contaminants are necessary if other techniques do not suffice to provide a valid estimate of the risk of exposure and to assess the existing control measures. This will be necessary unless the risk assessment shows the exposure is unlikely to ever exceed the limit.Īirborne concentrations of hazardous substances should be measured in all places of work where this is necessary to ensure the safety and health of workers against inhalation risks. To comply with this requirement to reduce exposure so far as is reasonably practicable, employers will need to implement a programme of air monitoring to ensure that workers are not exposed to substances to an extent which exceeds the workplace exposure limit.
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