Heavy Equipment Operator Certification Exam Prep · Question
An aggregate plant is experiencing high levels of crystalline silica dust. What is the occupational exposure limit (OEL) for respirable crystalline silica in Ontario?
Ontario Regulation 490/09, Designated Substances – Silica, sets the occupational exposure limit for respirable crystalline silica at 0.05 mg/m³ TWA, reflecting
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Question: An aggregate plant is experiencing high levels of crystalline silica dust. What is the occupational exposure limit (OEL) for respirable crystalline silica in Ontario?
Answer options: ✅ 0.05 mg/m³ TWA (Time-Weighted Average)
- 0.5 mg/m³ STEL (Short-Term Exposure Limit)
- 5.0 mg/m³ TWA
- 10.0 mg/m³ Ceiling Limit
Correct answer: 0.05 mg/m³ TWA (Time-Weighted Average)
Explanation: Ontario Regulation 490/09, Designated Substances – Silica, sets the occupational exposure limit for respirable crystalline silica at 0.05 mg/m³ TWA, reflecting the severe health risks associated with prolonged exposure.
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