What is the difference between ILO Convention No. 155 and No. 161?

Convention No. 155 (1981) sets the broad framework of national occupational safety and health policy and employer duties, while Convention No. 161 (1985) specifically requires the progressive development of occupational health services for workers.

Does ratifying an ILO convention make it national law automatically?

No; ratification commits a state to give effect to the convention, but the obligations generally take legal force through national legislation and regulations that implement them.

Occupational Health Legislation

Occupational health legislation is the body of binding law and international convention that obliges states, employers, and (in some systems) workers to protect health and safety at work. It establishes duties of care, rights to information and participation, enforcement mechanisms, and the legal basis for inspection, compensation, and the provision of occupational health services.

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Definition

Occupational health legislation is the set of legally binding statutes, regulations, and international conventions that define and enforce the obligations of states and employers to prevent work-related ill health and injury and to safeguard the health, safety, and welfare of workers.

Scope

This topic covers the structure and purpose of occupational health and safety law: the international instruments (chiefly ILO conventions) that set a normative floor, the way national statutes translate them into enforceable duties, and the institutions of enforcement and compensation. It is reference-educational and does not state the law of any particular jurisdiction or give legal advice.

Core questions

What duties does occupational health legislation place on employers, states, and workers?
How do international conventions such as ILO No. 155 and No. 161 shape national law?
How are legal obligations enforced through inspection, sanction, and compensation?
How does legislation interact with technical standards and occupational health services?

Key concepts

Employer duty of care
ILO Convention No. 155 (Occupational Safety and Health)
ILO Convention No. 161 (Occupational Health Services)
Goal-setting versus prescriptive regulation
Labour inspection and enforcement
Workers' compensation
Right to information and consultation

Mechanisms

Legislation works by assigning legal duties and rights, then attaching enforcement and remedy. International conventions provide a normative framework that ratifying states implement through national statutes and subordinate regulations; these in turn impose employer duties (risk assessment, prevention, provision of services), confer worker rights (information, consultation, refusal of dangerous work), and authorize inspection and sanction. Many modern regimes use a goal-setting (or framework) approach that states broad duties and relies on technical standards and guidance to specify how they are met (Park, 2024).

Clinical relevance

Legislation defines the legal context in which occupational health professionals operate, including mandates for health surveillance, fitness-for-work assessment, and reporting of occupational disease. The topic explains the legal architecture of protection; it is not a substitute for jurisdiction-specific legal advice or for individualized clinical or compliance decisions.

Evidence & guidelines

The principal international instruments are the ILO Occupational Safety and Health Convention (No. 155, 1981) and the Occupational Health Services Convention (No. 161, 1985), supplemented by national framework laws. Comparative analyses examine how these conventions are reflected in national statutes (Park, 2024), and survey evidence shows wide variation in how legal mandates for occupational health services are realized in practice (Rantanen et al., 2017).

History

Statutory protection of working health began with nineteenth-century factory acts limiting hours and hazards, especially for children. The creation of the International Labour Organization in 1919 internationalized standard-setting. The Robens-style shift toward goal-setting, self-regulatory frameworks in the 1970s, together with ILO Conventions No. 155 (1981) and No. 161 (1985), shaped the modern legislative model adopted, with variation, across many national systems.

Debates

Prescriptive rules versus goal-setting frameworks: Detailed prescriptive standards offer clarity and easy enforcement but can lag behind new hazards, while goal-setting frameworks adapt more flexibly but place greater interpretive burden on employers and inspectors; legal systems balance the two differently.

Seminal works

ilo-c155-1981
ilo-c161-1985

Frequently asked questions

What is the difference between ILO Convention No. 155 and No. 161?: Convention No. 155 (1981) sets the broad framework of national occupational safety and health policy and employer duties, while Convention No. 161 (1985) specifically requires the progressive development of occupational health services for workers.
Does ratifying an ILO convention make it national law automatically?: No; ratification commits a state to give effect to the convention, but the obligations generally take legal force through national legislation and regulations that implement them.