​Hazard is defined as anything or any source that can cause harm to the human and damage to property. Basically hazards are classified into 5 namely:

1. Chemical hazards – e.g. Dust, Fumes, Vapour
   
   
2. Physical hazards – e.g.  Noise, Vibration, mechanical, electrical and fire
   
   
3. Biological hazards – e.g. Virus, Fungus , Bacteria
   
   
4. Psychosocial hazards – e.g. sexual harassment, peers influence and pressure
   
   
5. Ergonomic risk factor – e.g. incorrect way of lifting, repetitive motion and over reaching.