Question

In Canada and the USA, only the physical and health hazard classes of GHS are officially adopted. The other class that is optional is:

a) Environmental hazard
b) Biological hazard
c) Explosive hazard
d) Fire hazard

Answer 1

The optional GHS class not officially adopted in Canada and the USA is the Environmental hazard.

Step-by-step explanation:

In Canada and the United States, the Global Harmonized System (GHS) officially adopts only the physical and health hazard classes. The optional class that is not officially adopted by GHS in these countries is a) Environmental hazard. Environmental hazards involve potential threats to the environment and can sometimes pose indirect risks to human health, such as through contaminated water or air. However, this classification is not required by GHS in the United States and Canada, which focus more on hazards that have immediate risks to workers' health and safety.