Week 5: Risk Assessment and Management

Okay so you know about the Environmental Health Hazards, right? I talked about it in the previous blog. This time, we will get to learn more about the Risk Assessment and Management, sound exciting isn’t it? XD

Managing Risks includes 3 following steps:

  1. Identification of hazards (This was what we learnt last week)
  2. Assessing the risk level (this contains two types: Likelihood and Severity of impact)

So yeah, in this step, you need to analyze and decide on how likely it is for the risk to happen as well as how severe the risk is on a scale of 1 to 5. The risk is calculated by multiplying the Likelihood with the Severity. You can find it in the table below how high the risk is after calculating, with 1 being insignificant in consequences and rare in likelihood.

Kết quả hình ảnh cho risk assessment

My group did a risk rating on Artificial colors and this is our result:


Scale 1-5 1. Insignificant 2.  Minor 3. Moderate 4. Major 5. Catastrophic
Likelihood 5. Almost certain
4. Likely
3. Moderate


2. Unlikely
1. Rare
      According to the result, our risk rating is: 3*3 = 9, which is HIGH.
    3. Deciding on the risk management option

There are 5 options can be used to influence the source, the pathway, the exposure or a combination simultaneously.

Kết quả hình ảnh cho hierarchy of hazard control

References and further reading:




0674258592.01.MZZZZZZZ Environmental Health Revised Edition, Dade W. Moeller.


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