The size of environmental health risk is determined by the possibility of harm and exposure level, and is also closely related to individual sensitivity. The risk is variable. On the one hand, even highly toxic chemicals do not have to worry about their health risks if they are not in close contact with the human body or the ecological environment.
On the other hand, even those chemicals that are considered harmless may bring risks to health when the exposure level accumulates to a certain extent.
Absolute safety "zero risk" cannot be achieved under any circumstances, and risk decision-making is the balance between risk and income. Take chemicals for example. Everything on the earth is made of chemicals, and we all live in chemicals. Chemical substances have brought convenience to our daily life and production activities in many ways.
At the same time, it may also bring harm to human health or adversely affect the ecological environment. It is impossible for us to completely eliminate pollutants or harmful factors in the environment, and we can only try our best to control the risks within a relatively safe range and make its impact on the environment and health at an acceptable level.
Formulate ecological environment quality standards and environmental hygiene standards to protect public health. Under certain technical and economic conditions, the restrictive provisions of these standards on the allowable content of pollutants or harmful factors can ensure the relative safety of public health.