Question

(selection of topic synthetic chemical and their effect on human beign) this is my topic of EVS please tell me something.................???????????​

Answer 1

Answer:

Humans and animals have always been exposed to chemicals in our environment - natural products in foods, smoke from cooking fires, sewage in drinking water, pesticides from plants. However, the dramatic increases in industrialization over the past three centuries have dramatically changed both the quality and the quantity of human exposures, to both natural and synthetic chemicals. We all know that certain things are bad for us - cigarette smoke, alcohol, lead, ozone (too much - or too little). But what about other substances in our environment such as gasoline fumes, dry cleaning fluids, pesticides, wood smoke, heavy metals? Environmental health risk assessment allows us to identify the potential hazards to human health and understand how serious such problems may be. It is composed of four components: exposure assessment; hazard identification; dose/response assessment; and risk characterization. Risk assessment is the scientific basis for standard setting. However, regulatory decision-making always involves issues other than science.