NIOSH Safety and Health Officer (SHO) - Occupational Health (Malaysia) cheat sheet
NIOSH Safety and Health Officer (SHO) - Occupational Health (Malaysia) · Keep the key ideas within reach.
Occupational Health
Occupational health aims to promote and maintain the highest degree of physical, mental and social well-being of workers in all occupations (ILO/WHO definition).
Occupational exposure limits (OELs) are expressed as TWA (8-hour time-weighted average), STEL (15-minute short-term exposure limit), and Ceiling (never to be exceeded); Malaysia adopts OELs in the Occupational Safety and Health (Use and Standards of Exposure of Chemicals Hazardous to Health) Regulations 2000 (USECHH).
TWA formula: TWA = (C1T1 + C2T2 + ... + CnTn) / 8, where C is concentration and T is time in hours; used to compare against the 8-hour OEL.
Biological monitoring assesses internal dose (e.g., blood lead, urinary mercury) and is required when a chemical's OEL has a skin notation or when biological exposure indices (BEIs) are specified.
Occupational lung diseases include pneumoconioses (silicosis from respirable crystalline silica, asbestosis, coal workers' pneumoconiosis), occupational asthma, and byssinosis (cotton dust).
Noise-induced hearing loss: initial dip at 4000 Hz, then 3000-6000 Hz; permanent threshold shift is irreversible; hearing conservation programme required at 85 dBA (action level) and 90 dBA (PEL) under the Factories and Machinery (Noise Exposure) Regulations 1989.
Heat stress assessment uses WBGT (wet bulb globe temperature) and ACGIH TLVs; acclimatisation, fluid replacement, work-rest cycles, and monitoring of core body temperature are key controls.
Occupational skin diseases (contact dermatitis, occupational acne, skin cancer) account for a large proportion of occupational illness; patch testing may be used for diagnosis.
Occupational infection risks include bloodborne pathogens (HBV, HCV, HIV), tuberculosis, and zoonoses; standard precautions and post-exposure prophylaxis are core measures.
Occupational Safety
Hierarchy of controls (most to least effective): elimination, substitution, engineering controls, administrative controls, and personal protective equipment (PPE).
Hazard identification tools include job safety analysis (JSA), hazard and operability study (HAZOP), failure mode and effect analysis (FMEA), and safety inspection checklists.
Risk assessment matrix: risk = likelihood × severity; commonly uses a 5×5 matrix with ratings from low to high; residual risk after controls must be ALARP (as low as reasonably practicable).
Machine guarding: guards must prevent access to danger points (nip points, rotating parts); interlocks should stop hazardous motion when guard is removed; emergency stops must be clearly identifiable and readily accessible.
Confined space entry requires hazard assessment, atmospheric testing (oxygen 19.5-23.5%, LEL <10%, H2S <10 ppm, CO <35 ppm), ventilation, attendant, communication, and rescue plan under the Industry Code of Practice for Safe Working in a Confined Space 2010.
Electrical safety: lockout/tagout (LOTO) of energy sources before maintenance; earth leakage circuit breakers (ELCB) and residual current devices (RCD) protect against earth faults.
Hazardous energy control (LOTO) steps: notify, shutdown, isolate, lock/tag, release stored energy, verify isolation.
Fire safety: fire triangle (fuel, oxygen, heat); fire extinguisher classes A (ordinary combustibles), B (flammable liquids), C (gases), D (metals), and electrical (E); PASS technique (Pull, Aim, Squeeze, Sweep).
Incident causation models include the domino theory (Heinrich), Swiss cheese model (Reason), and loss causation model; investigation should identify root causes, not just immediate causes.
OSH Legislation and Regulation (Malaysia)
Occupational Safety and Health Act 1994 (Act 514) is the principal OSH law; applies to all industries except those under the armed forces and maritime; imposes general duties on employers, employees, designers, manufacturers, importers, and suppliers.
OSH Act 1994 general duties: employer to ensure safety, health and welfare of employees and others affected (Section 15); employee duty to take reasonable care (Section 24); duty to report accidents (Section 32).
Factories and Machinery Act 1967 (Act 139) covers factories and machinery registration, certificate of fitness for pressure vessels and hoists, and safety of machinery; administered by DOSH.
Occupational Safety and Health (Safety and Health Committee) Regulations 1996: employers with 40 or more employees must establish a Safety and Health Committee; composition includes management and employee representatives.
Occupational Safety and Health (Use and Standards of Exposure of Chemicals Hazardous to Health) Regulations 2000 (USECHH): requires chemical register, MSDS (now SDS), risk assessment, exposure monitoring, health surveillance, and training.
Occupational Safety and Health (Notification of Accident, Dangerous Occurrence, Occupational Poisoning and Occupational Disease) Regulations 2004: notify DOSH within 7 days for accidents causing >4 days lost time; immediate notification for fatal accidents and dangerous occurrences.
Occupational Safety and Health (Noise Exposure) Regulations 2019 replaced the 1989 Factories and Machinery noise regulations; sets action level 80 dBA and exposure limit 85 dBA (8-hour TWA).
Employment Act 1955 provides for working hours, rest days, annual leave, sick leave, and maternity protection; not an OSH statute but relevant to worker welfare.
DOSH (Department of Occupational Safety and Health) enforces OSH legislation; penalties include fines and imprisonment; officers have powers of inspection, investigation, and prosecution.
OSH Management and Risk Control
Deming cycle (PDCA): Plan (policy, planning), Do (implementation and operation), Check (checking and corrective action), Act (management review and continual improvement) underpins OSH management systems.
ISO 45001:2018 is the international standard for occupational health and safety management systems; key elements include context of the organization, leadership and worker participation, planning, support, operation, performance evaluation, and improvement.
Risk assessment process: identify hazards, determine who may be harmed and how, evaluate risks (likelihood × severity), record significant findings, implement controls, and review.
Risk control hierarchy (elimination, substitution, engineering, administrative, PPE) should be applied; PPE is the last line of defence and requires training, fit testing, and maintenance.
Safety and health committee functions: assist in developing safety rules, review risk assessments, investigate incidents, promote safety awareness, and monitor effectiveness of controls.
Key performance indicators (KPIs) for OSH include lost time injury frequency rate (LTIFR) = (number of lost time injuries × 1,000,000) / total hours worked; severity rate = (lost days × 1,000,000) / total hours worked.
Emergency preparedness and response: emergency plan, evacuation drills, first aid, firefighting, spill response, and business continuity; regular review and testing required.
Training and competence: OSH training needs analysis, induction, refresher training, and record keeping; competency-based training ensures workers can perform tasks safely.
Management review: top management reviews OSH performance, incidents, audit results, legal compliance, and opportunities for improvement at planned intervals.