Final answer:
Tetraethyl lead is a poisonous product that is still used in some third world countries, despite being banned in many other countries.
Step-by-step explanation:
Tetraethyl lead is a poisonous product that was widely used in gasoline until it was banned in many countries due to its harmful effects on human health and the environment. However, it is still used in some third world countries where regulations may not be as strict. This compound releases lead particles into the air when gasoline is burned, leading to air pollution and potential lead poisoning.
Learn more about Poisonous product in third world countries