Human Environmental Hazards

Physical hazards affect people around the world regardless of wealth, place, or other factors that often distinguish people from culture. Physical hazards in the environment are naturally occurring events and disasters that can threaten personal safety. Hurricanes, volcanic eruptions, tornadoes, earthquakes, floods, landslides are all kinds of physical hazards that can have devastating effects on the human body (Library Index, Natural Disasters, 2011).

The environment preserves human life, but it can also cause disease. The lack of basic necessities is an important cause of human death. Environmental disorders increase the risk of cancer, heart disease, asthma and many other diseases. These hazards can be physical ones such as pollution, toxic chemicals, food contaminants, social things such as dangerous work, poor housing environment, urban disorder and poverty. Insecure drinking water and inadequate sanitation and hygiene are the causes of various infectious diseases such as schistosomiasis, diarrhea, cholera, meningitis and gastritis. In 2015, 350,000 children (mainly developing countries) under 5 years of age die from diarrheal diseases associated with unsafe drinking water and approximately 1.8 billion people use drinking water contaminated with feces did. More than 2 billion people can not access basic sanitation

Human vulnerability Humans are vulnerable to extreme temperatures, stresses, and exposure to chemicals, which can lead to death, injury or illness. The physiological responses of affected people are often different for every risk factor such as water, wind, ionizing radiation, toxic chemicals, infectious agents, etc. That is, if the contact levels are the same, some people will die, some people will be seriously injured, some people will suffer minor injuries and the rest will be intact. Usually, the most vulnerable to any environmental stress is very young, very old, and immune system weak.

The risks of human health and the environment can be adversely affected (see the road to bad results). Therefore, risk is a function of risk and exposure. Danger is the inherent danger or damage such as the toxicity of the compound. Exposure is likely to come in contact with danger. Therefore, considering the biological composition, activity and location of the human body (or other organisms) (see exposure), the exposure is close to zero, so very dangerous substances will approach zero as well. Another example of a health risk is the increased likelihood of HIV infection due to certain actions such as dangerous sexual intercourse.