Importance assessment of risk factors

Health risk factors refer to substances or behaviors that may cause harm to people's health in production, and are divided into physical factors and chemical factors according to occupational hazard factors. The evaluation of health hazard factors is to study and analyze them and judge the size and severity of their harm to human body. The concept of health risk factors is gradually developed in the process of understanding the causes of diseases. Some risk factors such as acute diseases, infectious diseases and injuries are mostly single cause and single fruit, which has great prevention and control value. However, many chronic diseases can hardly be explained by a single cause. For example, smoking is one of many causes of lung cancer, so the epidemiological risk factors of chronic diseases are an integral part of the causes. Because the etiology of chronic diseases is complex, evaluating its risk factors can be used as a method to study the etiology of chronic diseases, and can also be used as an integral part of chronic disease prevention and treatment.

According to the object and nature of health risk assessment, it can be divided into individual assessment and group assessment. Self-administered questionnaires or biomedical measurements are usually used. Risk factors refer to factors that can cause casualties or sudden damage to articles. Harmful factors refer to factors that can affect people's health, cause diseases or cause chronic damage to things. Usually, the two are called dangerous and harmful factors indiscriminately.

Identification method of dangerous and harmful factors

Method is a tool to identify dangerous and harmful factors, and the choice of which method should be based on the nature, characteristics, different stages of life and the knowledge, experience and habits of the analyst. The commonly used analysis methods of hazardous and harmful factors can be roughly divided into two categories: intuitive empirical analysis and system safety analysis.

Major hazard sources refer to units that produce, process, transport, use or store hazardous substances for a long time or temporarily, and the quantity of hazardous substances is equal to or exceeds the critical quantity.

At present, major hazards are determined internationally according to the types and limits of hazardous substances. For example, the Seveso Act of the European Union lists the names and limits of some dangerous and harmful substances.