COSHH Explained: Hazardous Substances Risk Assessment & Safety Guide (2026)

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 Introduction

Hazardous substances are present in almost every workplace, from cleaning chemicals to industrial materials. Without proper control measures, these substances can cause serious health issues, environmental damage, and workplace accidents.

COSHH (Control of Substances Hazardous to Health) is a safety framework designed to protect workers from harmful exposure.

This guide explains COSHH regulations, risk assessment steps, hazard types, and safety control measures.

What is COSHH?

COSHH stands for Control of Substances Hazardous to Health.

It is a system used to manage risks from hazardous substances such as:

  • Chemicals
  • Dust
  • Vapors
  • Gases
  • Fumes
  • Biological agents

COSHH helps employers identify, assess, and control exposure risks.

Types of Hazardous Substances

Chemicals

Industrial chemicals, cleaning agents, solvents.

Dust

Construction dust, silica dust, wood dust.

Fumes

Welding fumes and combustion gases.

Vapors

Evaporation from liquids like fuel or solvents.

Biological Hazards

Bacteria, viruses, fungi.

Coshh hazard symbols chart showing toxic flammable corrosive and harmful substances


Health Risks of Hazardous Substances

Exposure to harmful substances can cause:

  • Respiratory diseases
  • Skin irritation and burns
  • Eye damage
  • Long-term illnesses (e.g., cancer)
  • Poisoning

COSHH Risk Assessment (Step-by-Step)

  1. Identify hazardous substances
  2. Determine who may be harmed
  3. Evaluate exposure risks
  4. Implement control measures
  5. Monitor and review regularly
Coshh risk assessment steps flowchart identifying hazards evaluating risks and control measures

How to Conduct a Modern Risk Assessment 5-Step Guide 

Hierarchy of Control for COSHH

  • Elimination
  • Substitution
  • Engineering controls
  • Administrative controls
  • PPE

Using this hierarchy ensures effective risk reduction.

Hierarchy of control pyramid elimination substitution engineering administrative ppe


Control Measures for Hazardous Substances

Ventilation Systems

Remove harmful fumes from the workplace.

Safe Storage

Store chemicals properly with labels.

Training and Awareness

Educate workers about hazards.

Spill Control Measures

Prepare for emergency situations.

Personal Protective Equipment (PPE)

Workers handling hazardous substances should use:

  • Gloves
  • Respirators
  • Safety goggles
  • Protective clothing

Safety Data Sheets (SDS)

SDS provide important information about:

  • Chemical properties
  • Hazards
  • Handling procedures
  • Emergency measures

Workers must understand SDS before handling chemicals.

Role of Safety Officers

Safety officers ensure:

  • COSHH compliance
  • Proper risk assessments
  • Worker training
  • Safe handling procedures
  • Emergency preparedness

Conclusion

Chemical spill emergency response steps containment cleanup and reporting

COSHH plays a vital role in protecting workers from hazardous substances. By following proper risk assessment procedures and control measures, organizations can create a safer workplace.

Employers must ensure compliance, training, and continuous monitoring to prevent health risks.

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