This lesson introduces environmental agents and explains how exposures can become hazards that affect human health. Understanding the sources and types of agents helps individuals, nurses, and communities recognize risks and take protective action.
An environmental agent is a substance or factor that can interact with the environment or people and potentially affect health. An environmental hazard is a condition with the potential to cause harm. Agents may pollute the air, water, or land, but the presence of an agent does not by itself describe the full health impact: the type and amount of exposure, its duration, and a person’s vulnerability also matter.
All flashcards
What is an environmental agent?
A substance or factor that can interact with the environment or people and potentially affect health. Agents may be biological, chemical, or physical.
How does an environmental agent differ from an environmental hazard?
An agent is a substance or factor; a hazard is a condition with the potential to cause harm. Exposure and vulnerability help determine the possible health impact.
What are teratogens and carcinogens?
Teratogens can disrupt embryo development, while carcinogens can cause or contribute to cancer. Alcohol during pregnancy is a teratogenic concern; tobacco, asbestos, and radon are examples of carcinogens.
What makes nanoplastics a potential concern?
Their extremely small size can allow them to travel through air and water, evade some treatment processes, enter tissues, and carry pollutants or microorganisms. Human health effects remain an active area of research.
Name the three main categories of environmental agents and give an example of each.
Biological agents include bacteria; chemical agents include lead; and physical agents include noise or radiation.
Quiz questions
Which five pollutants does the EPA track for the Air Quality Index (AQI)?Answer: Ground-level ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide
What conditions form ground-level ozone?Answer: Volatile organic compounds and nitrogen oxides react in sunlight.
What is the EPA’s maximum contaminant level goal for lead in drinking water?Answer: Zero
What best describes a brownfield property?Answer: Property that is contaminated, or suspected of contamination, from prior commercial or industrial use
What is a central purpose of EPCRA?Answer: To support emergency planning and public access to information about certain facility chemicals and releases
Based on Population Health for Nurses by Jessica Ochs, Sherry L. Roper, Susan M. Schwartz (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.