What is the correct sequence of risk assessment of environmental contaminants? Choose the correct answer from the options given below.

1.Exposure assessment

2.Dose-response assessment

3.Risk assessment

4.Hazard identification

5.Risk characterization

A4, 1, 2, 5, 3 ✓ Correct

B4, 1, 2, 3, 5

C3, 5, 4, 2, 1

D5, 3, 2, 1, 4

Correct answer: (A) 4, 1, 2, 5, 3

Explanation

The risk assessment of environmental contaminants proceeds as hazard identification, exposure assessment, dose-response assessment, risk characterization, and finally the overall risk assessment, giving the order 4, 1, 2, 5, 3.

Hazard identification (4) comes first to determine whether an agent can cause harm.

Exposure assessment (1) then measures who is exposed and how much.

Dose-response assessment (2) relates the level of exposure to the probability of an effect.

Risk characterization (5) integrates these to describe the nature and magnitude of risk.

Risk assessment (3) is the summary judgement that feeds into risk management decisions.

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