Ontario Construction Site Head Protection Requirements

This document outlines the legal requirements and regulations in Ontario for mandatory hard hat use and head protection on construction worksites, as per occupational health and safety legislation.

Legal Requirements and Regulations

Occupational Exposure Limits

• Ontario has established Occupational Exposure Limits (OELs) for various substances that may be present on construction sites. These limits are designed to protect workers from the harmful effects of exposure to these substances.

Exposure Controls

• Engineering controls should be implemented to ensure adequate ventilation, especially in confined areas. All national and local regulations must be observed.
• Emergency eyewash fountains and safety showers should be readily available in areas where potential exposure exists.

Personal Protective Equipment (PPE)

• In situations where sufficient ventilation is not available, respiratory protection should be used.
• Wear protective gloves.
• Wear protective clothing.
• Wear protective goggles.
• Use a face shield.

Specific Substances and Exposure Limits

The following table outlines the Ontario OELs for specific substances that may be encountered on construction sites:

Substance	OEL TWA (mg/m3)
Limestone	10 mg/m3 (inhalable)
Calcium sulfate dihydrate	10 mg/m3 (inhalable)
Magnesium oxide (MgO)	10 mg/m3 (inhalable)
Kaolin	2 mg/m3 (containing no Asbestos and <1% Crystalline silica-respirable)
Calcium oxide	2 mg/m3
Particulates not otherwise classified (PNOC)	10 mg/m3 (inhalable) 3 mg/m3 (respirable)

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