Environmental Health

Environmental health describes the effects of civilization, culture, personal habits, pollution, population growth, and travel on human health. It is a new science that measures a variety of factors leading to acquired and congen­ital diseases. Acquired diseases are illnesses people get from exposure to harmful chemicals, injurious activities, and pathogenic organisms. Congen­ital diseases are caused by genetic defects or factors that harm fetal devel­opment.

Throughout history people have witnessed the increase in human dis­ease with the growth of agriculture and cities. It was not until the late nine­teenth century that people had scientific explanations for the cause of the diseases. Urban growth and overpopulation are associated with higher inci­dences of communicable diseases spread by insects, rats, and humans. Agri­culture also resulted in a host of new human diseases. A variety of diseases, such as influenza, measles, and smallpox, may have been developed from diseases originally found in agricultural animals.

The role of pollution and health was not well known to the public un­til the publication of Silent Spring, written by Rachel Carson in 1962. She alerted people to the health effects of pesticides and other pollutants on hu­mans and wildlife. Many scientists supported her views, and this resulted in the formation of the Environmental Protection Agency by the U.S. gov­ernment in 1970. The National Institutes of Health was later set up to look at other environmental health issues. This agency focuses on illnesses asso­ciated with household and work environments. In 1948 the World Health Organization was formed by the United Nations to deal with international environmental health problems.

Occupational health and wellness includes health issues related to the work environment. Some issues include injuries due to certain activities or illness due to handling certain chemicals. Ergonomics is a field of study that has linked conditions such as carpal tunnel syndrome to repetitive hand ac­tions such as continuous typing on a keyboard or handling automobile parts on an assembly line.

Mental health is also a concern of public health agencies working in en­vironmental health. Abuse, poverty, violence, and stressful work environ- ments are associated with mental illnesses. Public health agencies seek ways of changing the social environment in attempts to reduce mental disease.

Today, scientists are continuously conducting research linking envi­ronmental factors to human illness. There are two types of environmental health research: experimental research and epidemiological research.

Environmental health experiments involve laboratory and field tests that show how an environmental factor can cause a particular disease. For ex­ample, animal experiments are showing that many types of water pollution will cause birth defects, cancer, and reproductive disorders. Epidemiologi­cal research techniques involve collecting data associating a particular ill­ness to a certain activity or environmental factor. The data are gathered through surveys, public medical records, and field studies. Air pollution has been linked to increases in asthma and emphysema in epidemiology human studies. This was determined by comparing high rates of asthma and em­physema to increased levels of air pollution in an area.

Laws prohibiting smoking in many public areas are recent examples of government policy based on environmental health research. Food safety reg­ulations controlling the amount of pesticides in foods are another example. The Environmental Protection Agency set laws that limit pollution to lev­els that do not cause illness to humans and wildlife.

References

Miller, Tyler. Environmental Science, Sustaining the Earth, 4th ed. Belmont, CA: Wadsworth Publishing Company.

U.S. Environmental Protection Agency. <www.epa.gov>.

U.S. National Institutes of Health. <www.nih.gov>.

World Health Organization. <www.who.int>.