Exposure time can be measured using various methods, depending on the type of toxicant and the context of the exposure:
Environmental Monitoring: Measuring the concentration of a toxicant in the environment over time, such as air, water, or soil sampling. Biomonitoring: Assessing levels of toxicants or their metabolites in biological samples, such as blood, urine, or tissues. Exposure Modeling: Using mathematical models to estimate exposure levels based on known data and scenarios.