Your first step into Environment, Health & Safety — what it is, where it comes from, and what professionals in this field actually do every day.
Before you can protect people and the planet, you need to understand what EHS is, what it covers, and how the three disciplines are connected.
EHS is the integrated management of environmental impacts, occupational health, and workplace safety to protect workers, communities, and the natural environment from harm caused by work activities.
Managing the impact of operations on air, water, soil, biodiversity, and climate. Governed by EPA regulations, ISO 14001, and international treaties.
Preventing occupational illness — exposure to chemicals, noise, vibration, radiation, biological agents. Guided by OSHA, NIOSH, ACGIH exposure limits.
Preventing injuries and fatalities from workplace hazards: falls, machinery, fire, electricity. Governed by OSHA standards and NFPA codes.
ILO Convention C155 (1981) — The International Labour Organization's Occupational Safety and Health Convention establishes the foundational principle that every worker has the right to a safe and healthy working environment. Ratified by 73 countries, it is the bedrock of national EHS legislation worldwide.
Understanding where EHS came from helps you appreciate why the laws and standards exist. Every major regulation was born from a tragedy.
Key learning: Almost every major safety regulation traces back to a catastrophic event. As an EHS professional, your job is to prevent the next one by learning from those that came before.
Before memorising specific regulations, understand this one principle — it underpins every safety law in the world.
"Each employer shall furnish to each of his employees employment and a place of employment which are free from recognised hazards that are causing or are likely to cause death or serious physical harm to his employees."
Why this matters: Even if no specific OSHA standard covers a hazard, OSHA can still cite an employer under the General Duty Clause. This means "there's no rule about it" is never a defence. Similar general duty principles exist in the UK Health and Safety at Work Act 1974 (Section 2), Canada's Canada Labour Code, and Australia's Work Health and Safety Act 2011.
OSH Act 1970, Section 5(a)(1). General Duty Clause. OSHA enforces ~10 million workplaces covering 144 million workers.
Health and Safety at Work Act 1974. "So far as is reasonably practicable" (SFAIRP) standard. Enforced by the Health and Safety Executive.
EU Framework Directive 89/391/EEC requires member states to protect workers' health and safety. Implemented by national legislation across 27 countries.
ILO Conventions C155, C161, C187 establish international minimum standards for occupational safety adopted by member states worldwide.
As an EHS professional, you will refer to these organisations constantly. Know what each one does and what authority it has.
| Organisation | Full Name | Role & Authority | Key Output |
|---|---|---|---|
| OSHA | Occupational Safety and Health Administration | US federal agency. Sets and enforces legally binding workplace safety and health standards. Can issue citations and fines up to $156,259 per wilful violation (2024). | 29 CFR 1910 (General Industry), 29 CFR 1926 (Construction) |
| NIOSH | National Institute for Occupational Safety and Health | US federal research agency (CDC). Does NOT enforce — only recommends. Conducts research and sets Recommended Exposure Limits (RELs). | RELs, Health Hazard Evaluations, NIOSH Pocket Guide |
| EPA | US Environmental Protection Agency | US federal agency. Enforces environmental laws: Clean Air Act, Clean Water Act, RCRA, CERCLA. Can impose criminal and civil penalties. | 40 CFR (Code of Federal Regulations, environment) |
| ISO | International Organization for Standardization | International standards body. Publishes voluntary but widely adopted management system standards used in 165+ countries. Not a regulator. | ISO 45001:2018, ISO 14001:2015, ISO 9001:2015 |
| ILO | International Labour Organization | UN agency. Sets international labour standards through Conventions (legally binding on ratifying states) and Recommendations (non-binding guidance). | C155, C161, C176, C187, R164 |
| NFPA | National Fire Protection Association | US non-profit. Publishes fire, electrical, and life safety codes adopted by most US jurisdictions by reference. Not a government agency. | NFPA 70 (NEC), NFPA 101 (Life Safety Code), NFPA 70E |
| ACGIH | American Conference of Governmental Industrial Hygienists | US scientific organisation. Publishes Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs). Not a regulator but widely referenced. | TLV-TWA, TLV-STEL, TLV-Ceiling values |
| HSE | Health and Safety Executive | UK national regulator for workplace health and safety. Enforces the HSWA 1974 and subsidiary regulations. Can prosecute employers and individuals. | HSE Guidance Documents, ACoPs (Approved Codes of Practice) |
| WHO | World Health Organization | UN health agency. Provides global occupational health guidance, exposure limits for environmental contaminants, and supports national health systems. | WHO Air Quality Guidelines, Occupational Health Technical Series |
Remember the difference: OSHA sets and enforces binding regulations. NIOSH and ACGIH recommend limits. ISO publishes voluntary standards. ILO sets international conventions. As an EHS professional, you will use all of them — they complement each other.
EHS is a team effort. Under ISO 45001 and OSHA regulations, specific roles carry specific legal obligations — from the CEO to the frontline worker.
ISO 45001:2018, Clause 5.1 explicitly states that top management must demonstrate leadership and commitment to the OH&S management system. Safety is not just the safety officer's job — it is a board-level responsibility. OSHA reinforces this: corporate officers can be personally liable for wilful violations.
Workers' rights under international law: ILO Convention C155, Article 19 gives workers the right to remove themselves from danger. OSHA §11(c) prohibits retaliation against workers who report safety concerns. These rights are fundamental — no employer can legally punish a worker for refusing genuinely dangerous work.
Every modern EHS management system — whether ISO 45001, ISO 14001, or OSHA's Voluntary Protection Program — is built on the same four-step improvement cycle.
Identify hazards, assess risks, set objectives, and design the EHS program. Establish legal and regulatory compliance obligations.
Implement controls, training, emergency procedures, and operational processes. Put your plan into practice.
Monitor performance, conduct audits, investigate incidents, evaluate legal compliance, and measure against objectives.
Review results, correct failures, update the system, and continually improve. Management review is required by ISO 45001 §9.3.
ISO 45001:2018 is built entirely around the PDCA cycle. Clause 4 is "context", Clause 5 is "leadership", Clauses 6–10 map to Plan→Do→Check→Act respectively. Understanding PDCA means you already understand the structure of every major management system standard including ISO 9001 (quality) and ISO 14001 (environment).
These numbers show why EHS is one of the most important professions on the planet. Every statistic represents real people.
Work-related deaths globally. 2.4 million from occupational diseases, 380,000 from workplace accidents.
Non-fatal work-related injuries and illnesses requiring time away from work. Source: ILO global estimates.
The economic cost of occupational injuries and diseases — approximately $3.1 trillion USD annually.
Fatal work injuries in the USA. Transportation incidents (38%), falls (17%), contact with objects (18%).
The business case for EHS: For every $1 invested in workplace safety, OSHA estimates organisations save $4–6 in reduced injury costs, lower insurance premiums, higher productivity, and avoided regulatory penalties. ISO 45001 certification has been shown to reduce injury rates by up to 25% in certified organisations. EHS is not just a legal obligation — it is a business advantage.
EHS is a structured profession with recognised qualifications. Here is your roadmap — from your first day to senior specialist level.
Recommended starting path: OSHA 10/30 → NEBOSH NGC → ASP → CSP. If you are outside the US, start with NEBOSH NGC, then pursue IOSH membership (TechIOSH → GradIOSH → CMIOSH). For environmental focus, add EPA certifications and work toward CHMM.
1. Which international convention establishes a worker's right to remove themselves from a situation of imminent danger without fear of reprisal?
2. The Plan–Do–Check–Act cycle is the structural foundation of which standard?
3. Under the OSHA Act 1970, which section prohibits employers from retaliating against workers who report safety concerns?
4. According to ILO global estimates, approximately how many workers die from work-related causes each year?
5. Which organisation publishes Threshold Limit Values (TLVs) for chemical and physical agents in the workplace?