Lead poisoning
There is a choking hazard for children under 3 years of age. They are safe for older children as long as they are used according to the manufacturers recommendations.
I would say swallowing something that is not food. That can create many problems....all bad.
They're only hazardous to your health under unusual circumstances. Remember that guy who died in Arizona from overheating in a sauna? Steam showers have similar risks.
Hazard Communication training is required under the US OSHA regulations for every employee who works with OSHA defined hazardous materials. In addition, US Department of Transportation (DOT) regulations require Hazard Communication training for those HAZMAT employees who are involved with the transportation of regulated Hazardous Materials (Dangerous goods). The training provided to meet the OSHA requirements may also serve to meet the DOT requirements. The EPA also has Hazard Communication requirements for employees who deal with hazardous waste.
to report any hazard to the approprite authority
Under OSHA's Hazard Communication standard, yes, it is. This includes oil used in a vehicle engine, such as 10W30 motor oil.
gas under pressure means where there is alot of high leaked gas which may be a health hazard
The LD50 for polonium-210 is under 1 microgram; it is a very high radiotoxicity.
Markings on packages that identify a material as hazardous include the square-on-point, or diamond, hazard class labels as well as labels that list in words what the hazard may be, and the UN ID number and the Proper Shipping Name.
JP-8, a type of Jet Fuel with a flash point of 46 Cº, is a Class 3 Flammable Liquid under the regulations for Hazardous Materials Transportation.
Health and Safety Training Hazard Prevention and Control
a family who is exposed to hazardous waste buried under their house