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What common odour does low concentrations of H₂S have?
Low-level rotten egg smell
Sweet smell
No noticeable smell
Is H₂S gas heavier or lighter than air?
Heavier than air
Lighter than air
It has the same density as air
What does H₂S stand for?
Hydrogen sulfide
Hydrogen sulfate
Hydrogen steam
Where does it tend to accumulate?
It tends to accumulate in low-lying or enclosed areas
It tends to accumulate in open, well-ventilated areas
It tends to accumulate only at high levels
Why is relying on your nose dangerous at high levels?
At high levels H₂S can deaden your sense of smell
H₂S will burn your nose if you breathe it in
It can damage your sense of smell
If you detect an H₂S leak or the alarm on your personal monitor goes off, in which direction should you immediately evacuate?
Upwind and to higher ground
Downwind
Toward the leak source
What does a high gas reading indicate?
The area is completely safe
Control measures may be failing
An imminent threat to health
What is the best way to deal with H₂S exposure on a worksite?
Use a HEPA vacuum or damp wipe
Use dry brushing
Use compressed air only
What should you do if you suspect H₂S controls are ineffective?
Stop the work and review controls
Keep working and hope for the best
Ignore the issue if the task is short
What should workers do before starting a task where H₂S may be present?
Check the risk assessment and controls
Start immediately
Only wear gloves
What common industrial material does chronic or prolonged exposure to H₂S severely attack and weaken from the inside out?
Steel and iron
Concrete and stone
Plastic and rubber
Can human beings build up a natural biological tolerance or immunity to repeated exposure to H₂S?
No, repeated exposure can cause serious harm rather than immunity
Yes, the body becomes fully immune over time
Only if the exposure is very brief
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