The principal hazards of woodworking can be classified as either safety or
health hazards. Safety
hazards can cause immediate injury to a worker. For example, if a worker's hands were to contact a saw blade, he or
she could have one or more fingers cut off. Health hazards are associated with long-term exposure to certain substances or to excessive
noise levels or vibrations. Certain types of wood dust, for example, can cause allergic
reactions. Health hazards can cause both immediate (acute) and longer-term (chronic) health effects.