major hazards - mechanical hazards, electrical hazards, hazardous substances (e.g. gases, vapours, aerosols, liquids), fire and explosion hazard, thermal hazard, biological hazard (e.g. infection by means of microorganisms, virus or biological manufacturing substances. Hazards from special physical effects (e.g. noise, radiation, electromagnetic fields) hazard from working conditions (e.g. climate, lighting), physical strain (e.g. through movement or remaining in the same position), and other risk fac-tors - are present at the location, taking internal / external construction sites and work-shops particularly into consideration.