Continuous or repeated measurement of agents in the (working) environment to evaluate environmental exposure and possible damage by comparison with appropriate reference values based on knowledge of the probable relationship between ambient exposure and resultant health effects.
Source:
PAC, 2001, 73, 993. 'Risk assessment for occupational exposure to chemicals. A review of current methodology (IUPAC Technical Report)' on page 1022 (https://doi.org/10.1351/pac200173060993)