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.ġ2.2.5. Sampling should be carried out while the work activity is in operating.ġ2.2.4. 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. (c) from working areas which represent typical exposure.ġ2.2.3. ![]() (b) at various places in the working area to assess the extent of the chemical's general distribution and (a) close to sources of emission in order to evaluate concentrations or the standard of engineering controls Static monitoring should be used to determine the distribution of an airborne chemical throughout the general atmosphere of the working area and to identify problems and priorities. Sampling equipment should be compatible with the analytical methods available and should have been validated over a suitable range of concentrations above and below the exposure limits or other exposure criteria in accordance with published national or international standards. Where the need for a programme of measurements is determined for certain hazardous chemicals, the monitoring strategy should be followed.ġ2.2.1. The need for a programme for the measurement of airborne contaminants should be based on the factors listed in paragraph 12.1.4, the extent of the exposure of workers established as a result of the measurements taken, and the reliance on, and the consequent need to check the effectiveness of, engineering control measures. Simple qualitative tests include, where appropriate, the use of smoke tubes or pellets to determine ventilation characteristics, and of the dust lamp for illuminating dust emissions.ġ2.1.5. Techniques for this risk assessment may include the following: information on the intrinsic health and physical hazards, obtained from the chemical safety data sheets estimation of exposure based on the method of work and work pattern advice from the supplier experience of exposure in the workplace or of other users and simple qualitative tests. 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.ġ2.1.4. Airborne concentrations of hazardous chemicals should be measured in all places of work where this is necessary to ensure the safety and health of workers against inhalation risks.ġ2.1.3. ![]() Based on the monitoring data, employers should assess the exposure of workers to hazardous chemicals.ġ2.1.2. They should ensure that workers are not exposed to chemicals to an extent which exceeds exposure limits or other exposure criteria for the evaluation and control of the working environment. Employers should monitor and record the exposure of workers to hazardous chemicals to ensure their safety and health. Monitoring in the workplace 12.1 General principlesġ2.1.1.
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