Over time,Environmental risk analysis is a field of study that attempts to understand events and activities that bring risk to human health or the environment.
Human health and environmental risk is the likelihood of an adverse outcome. As such, risk is a function of hazard and exposure. Hazard is the intrinsic danger or harm that is posed, e.g. the toxicity of a chemical compound. Exposure is the likely contact with that hazard. Therefore, the risk of even a very hazardous substance approaches zero as the exposure nears zero, given a person's or other organism's