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.
Dry ice is classified as a hazardous material under Class 9 - Miscellaneous hazardous material. Asbestos is classified as a hazardous material under Class 9 - Miscellaneous hazardous material as well.
I would say swallowing something that is not food. That can create many problems....all bad.
Chloroform is classified as a hazardous substance due to its potential health effects, such as being a suspected carcinogen and having central nervous system depressant effects. It falls under the hazardous chemical class and is subject to regulations regarding its handling and storage to minimize risks to health and the environment.
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.
The LD50 for polonium-210 is under 1 microgram; it is a very high radiotoxicity.
According to the Material Safety Data Sheet (MSDS) of Air Liquide, solid CO2 (also known as "dry ice") has a hazard class number 9 (miscellaneous dangerous goods), and a UN identifier of 1845, packing class III.
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.