55 Industrial Health and Hygiene: Concept and Scope, Occupational Health Hazards (Physical · Chemical · Biological · Ergonomic · Psychosocial), Industrial Hygiene Cycle (Anticipation · Recognition · Evaluation · Control), Statutory Health Provisions (Sections 11-20 Factories Act, ESI Act 1948) and the OSH&WC Code 2020
55.1 Health is Productive Capital
A healthy worker is a productive worker. Industrial health is the positive state of physical, mental and social well-being of workers in relation to their occupation, while industrial hygiene is the anticipation, recognition, evaluation and control of workplace conditions that may harm worker health. Together they form the public-health side of occupational safety law. Indian statutory protection lies in Chapter III of the Factories Act 1948 (Sections 11-20), the Mines Act 1952, the ESI Act 1948 and is now consolidated in the Occupational Safety, Health and Working Conditions Code 2020.
55.2 1 · Concept and Definitions
| Term | Substance |
|---|---|
| WHO | Health is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity |
| ILO/WHO Joint Committee (1950) | Occupational health aims at the highest degree of physical, mental and social well-being of workers in all occupations |
| Industrial hygiene | The science of anticipation, recognition, evaluation and control of workplace environmental factors that may cause illness or impair well-being |
55.3 2 · Objectives of Occupational Health
The 1950 ILO/WHO Joint Committee, revised in 1995, set out five objectives:
- Promotion and maintenance of workers’ health and working capacity.
- Improvement of working environment and work to make them conducive to safety and health.
- Development of work organisation and culture supporting health.
- Prevention of occupational diseases and injury.
- Adaptation of work to the worker — not the worker to the work.
55.4 3 · Occupational Health Hazards
| Hazard category | Examples |
|---|---|
| Physical | Noise, vibration, heat, cold, illumination, radiation, humidity |
| Chemical | Gases, dust, fumes, vapours, mists, solvents, acids, alkalis, metals (lead, mercury) |
| Biological | Bacteria, viruses, fungi, parasites — agriculture, healthcare, sewage workers |
| Ergonomic | Repetitive motion, awkward postures, manual handling, force, vibration |
| Psychosocial | Stress, monotony, shift work, harassment, long hours |
55.5 4 · Industrial Hygiene Cycle — ARE-C
| Stage | Substance |
|---|---|
| Anticipation | Identify potential hazards before workers are exposed (design stage) |
| Recognition | Identify hazards in the existing work environment |
| Evaluation | Measure exposure — environmental monitoring, dose-response, comparison with limits |
| Control | Apply controls — elimination, substitution, engineering, administrative, PPE |
55.6 5 · Hierarchy of Controls
| Tier | Control | Example |
|---|---|---|
| 1 | Elimination | Remove the hazard entirely |
| 2 | Substitution | Use less hazardous material |
| 3 | Engineering controls | Enclosure, ventilation, shielding |
| 4 | Administrative controls | Work rotation, training, signage |
| 5 | PPE | Helmets, gloves, masks, respirators (last resort) |
55.7 6 · Statutory Health Provisions
55.7.1 Factories Act 1948 — Sections 11-20
| Section | Provision |
|---|---|
| 11 | Cleanliness — daily sweeping, painting, varnishing |
| 12 | Disposal of waste and effluent |
| 13 | Ventilation and temperature — wet-bulb temperature, fans |
| 14 | Dust and fume removal |
| 15 | Artificial humidification |
| 16 | Overcrowding — minimum 14.2 m³ air space per worker |
| 17 | Lighting — sufficient and suitable |
| 18 | Drinking water — wholesome, near workplace; marked “Drinking water”; if 250+ workers, cool drinking water |
| 19 | Latrines and urinals — separate for male/female |
| 20 | Spittoons |
Section 16 mandates a minimum of 14.2 m³ of air space per worker (not less than 9.9 m³ for factories pre-1949). NTA stems test this figure.
55.7.2 Mines Act 1952
Provides for sanitation, ventilation in underground mines, drinking water, latrines, conservancy and medical examinations. Pithead baths and crèches are mandatory.
55.7.3 ESI Act 1948
Provides medical benefit, sickness benefit, maternity benefit, disablement benefit, and dependants’ benefit for insured workers in covered establishments.
55.8 7 · Permissible Exposure Limits
Workplace exposures to noise, dust, chemicals are subject to Permissible Exposure Limits (PEL) or Threshold Limit Values (TLV) per:
- ACGIH (American Conference of Governmental Industrial Hygienists) TLVs — global reference.
- Indian Standards by Directorate General of Factory Advice Service and Labour Institutes (DGFASLI).
- Schedules under various rules under Factories/Mines/Building Acts.
For example: noise — 90 dB(A) for 8 hours; dust — varies by type (free silica is most restrictive).
55.9 8 · Indian Institutional Framework
| Body | Role |
|---|---|
| DGFASLI | Statutory technical authority under Ministry of Labour — advises on safety, health, hygiene |
| Central Labour Institute (Mumbai) | Training and research |
| National Institute of Occupational Health (NIOH), Ahmedabad | Under ICMR — research, surveillance, diagnosis |
| Regional Labour Institutes (Kanpur, Kolkata, Chennai) | Regional training |
| Directorate General of Mines Safety (DGMS), Dhanbad | Safety/health regulation in mines |
55.10 9 · Occupational Health Service
A typical occupational health service at the plant includes:
- Pre-employment medical examination.
- Periodic medical examination.
- Treatment of occupational and non-occupational illnesses.
- First-aid and emergency care.
- Health education and counselling.
- Workplace inspection and hazard surveillance.
- Maintenance of medical records.
55.11 10 · Indian Practice — Numbers
| Provision | Threshold / Number |
|---|---|
| Minimum air space per worker | 14.2 m³ (post-1949 factories) |
| Cool drinking water | Where 250+ workers (Section 18) |
| First-aid box | One per 150 workers (Section 45) |
| Ambulance room | Where 500+ workers |
| Canteen | Where 250+ workers (Section 46) |
| Rest room | Where 150+ workers |
| Crèche | Where 30 women workers |
| Welfare Officer | Where 500+ workers |
55.12 11 · Position under the OSH&WC Code 2020
The Occupational Safety, Health and Working Conditions Code 2020 consolidates the Factories Act 1948, Mines Act 1952, Plantations Labour Act 1951, Contract Labour Act 1970, ISMW Act 1979, BOCW Act 1996 and other Acts. Key features:
- Uniform threshold definitions (factory = 20 with power / 40 without power).
- National OSH Advisory Board — central.
- Free annual medical examination for workers above 45 years.
- Mandatory letter of appointment.
55.13 12 · Critique
- Enforcement gap — limited factory inspectors; informal sector excluded.
- No comprehensive notifiable occupational disease registry in many states.
- PPE-last-resort principle often violated.
- Mental health and stress under-recognised.
55.14 Practice Questions
WHO defines health as:
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Section 16 of the Factories Act requires minimum air space per worker of:
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In the hierarchy of controls, the most effective measure is:
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Repetitive motion and awkward posture are which type of hazard?
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The industrial hygiene cycle has stages:
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DGFASLI stands for:
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NIOH (National Institute of Occupational Health) is at:
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DGMS, the safety regulator for mines, is headquartered at:
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Ventilation and temperature provisions are in:
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Cool drinking water (Section 18) is required where workforce exceeds:
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Workplace stress and shift work fall under:
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The ILO/WHO Joint Committee on Occupational Health was first set up in:
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PPE in the hierarchy of controls is regarded as:
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Occupational health and safety is now consolidated under:
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Match hazard with example:
| (i) | Physical | (a) | Solvent vapours |
| (ii) | Chemical | (b) | Tuberculosis bacteria |
| (iii) | Biological | (c) | Heat stress |
| (iv) | Ergonomic | (d) | Awkward posture |
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First-aid box in factories is required at the ratio of:
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An ambulance room is required at workforce of:
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Threshold Limit Values (TLV) are published by:
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A foundational principle of occupational health is to:
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Under the OSH&WC Code 2020, annual free medical examination is mandatory for workers above:
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55.15 Quick Recall
- Industrial health = positive well-being of workers; industrial hygiene = anticipation, recognition, evaluation, control (ARE-C).
- Five hazard categories: Physical, Chemical, Biological, Ergonomic, Psychosocial.
- Hierarchy of controls (most → least): Elimination → Substitution → Engineering → Administrative → PPE.
- Factories Act 1948 — health provisions in Chapter III / Sections 11-20. Key thresholds: 14.2 m³ air space; cool water at 250+; first-aid 1/150; ambulance at 500+.
- Indian institutions: DGFASLI (Mumbai), NIOH (Ahmedabad, under ICMR), DGMS (Dhanbad), Central Labour Institute and Regional Labour Institutes.
- ILO/WHO 1950 (revised 1995) — five-point occupational health framework.
- Threshold Limit Values (TLV) by ACGIH; Indian standards by DGFASLI.
- OSH&WC Code 2020 — consolidates Factories, Mines, Plantations, BOCW, Contract Labour, ISMW Acts; annual free medical examination for workers above 45.
- “Adapt the work to the worker” — foundational ILO/WHO principle.