Which insecticide is more hazardous to human health?

DDT is the most hazardous, non-biodegradable insecticide, which is fat soluble but insoluble in water. It persists in the environment for a very long period. Being fat soluble, it accumulates in the animal tissues and gets concentrated at different trophic levels of food chain. It each step, DDT is more concentrated. This is also called biomagnification.