Monitoring exposure to substances hazardous to health will sometimes be necessary in the workplace. This may be to ensure that employees are not Unnecessarily exposed to chemicals, may be in response to complaints from employees, to check the efficiency of engineering controls or to ensure that a workplace exposure limit (WEL) has not been exceeded.

Monitoring should use a suitable procedure and should be carried out at regular intervals and whenever changes occur which may affect exposure. Certain substances and processes have set monitoring frequencies. Monitoring exposure to the environment is also usually necessary in those businesses that make emissions to air, land or water.

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