Question

multiple choice
how many classes of hazardous products are in whmis 2022?
5
7
9
3

Explanation:

Identify the WHMIS hazard groups

WHMIS (Workplace Hazardous Materials Information System) categorizes hazardous products into major hazard groups: Physical Hazards and Health Hazards (plus Environmental Hazards, which is optional in Canada).

Count the hazard classes

Under WHMIS 2015, there are 31 hazard classes. Under WHMIS 2022 (which aligns with the 8th revised edition of the GHS), new hazard classes were added (such as Chemicals Under Pressure), bringing the total number of hazard classes to 33.

Match with options

The options listed in the image are:

• 5
• 7
• 9
• 3

These numbers do not represent the individual hazard classes (which total over 30), but rather the number of hazard classes that are assigned a WHMIS pictogram to represent them. Under WHMIS, there are exactly 9 distinct pictograms used to represent the hazard classes (excluding the biohazardous infectious materials pictogram which has its own unique circle design, or looking at the standard GHS pictograms). Let's re-evaluate the question: "How many classes of hazardous products are in WHMIS 2022?" or is it referring to the major hazard groups/pictograms?
Actually, WHMIS has 3 major hazard groups (Physical, Health, Environmental).
Let's look at the options: 5, 7, 9, 3.
The 3 major hazard groups are:

1. Physical hazards group
2. Health hazards group
3. Environmental hazards group

Therefore, there are 3 major hazard groups (or classes of hazard groups) in WHMIS 2022.

Answer:

• 5
• 7
• 9
• 3 (Correct answer)