What is Environmental Health and What Critical Issues Impact Our Health?

Water quality, safe housing, healthy food access, and pollution-free transportation all contribute to human health, along with many other factors. Where people live and how they're connecting to the world can affect their health. The environmental health field—with its professionals, policies, and programs—is focused on these factors.

Your health is determined by personal choices (like whether you exercise or get vaccinated) but also factors like local industry, the age of your home, food deserts, green space in your community, and more. Environmental stressors and advantages help to shape your options.

This article explains what environmental health is and how it can affect you and your community. It describes the work done by professionals and what you can do, too, to improve environmental health.

What Is Environmental Health?

Environmental health is the public health field that monitors and addresses physical, chemical, and biological factors that impact your health though they're not always within your direct control.

Simply put, environmental health is the area of public health that deals with all the different ways the world can impact physical and mental well-being. Examples of impacts include:

• Lead toxicity (poisoning) from the paint or water pipes in older homes and neighborhoods
• Obesity and type 2 diabetes risk in food deserts and food swamps (communities with limited access to grocery stores and healthy food options, but often home to fast food stops)
• Cancer and the impacts of air pollution, heat, ultraviolet radiation, and other carcinogens and climate factors
• Stress, sleep disruptions, hearing loss, and other impacts due to traffic and other environmental noise
• Depression, cognition, and other brain health factors can be affected by green space

If you live in an urban heat island with few trees, it may be hotter than other neighborhoods— affecting a range of issues, from heat-related illness to asthma and heart disease. It's harder to get outside and exercise, too. When your home was built and the materials used, what insects live nearby, and what food you can access affect your health and the health of your family.

Areas of Environmental Health

Environmental health is one of the largest fields within public health because of the myriad ways external forces can impact how people eat, live, and grow. These forces can be about addressing the natural environment (as in the case for clean water or sanitation), but they can also be the consequence of human beings' actions—including societal norms.

There are a number of initiatives focused on environmental health in the United States. Among them is the Healthy People 2030 agenda, which highlights six key areas that encompass the various ways environmental health is crucial to the health of communities.

Air Quality

Air is non-negotiable for humans. It's needed to survive and air quality can have a significant impact on health.

Poor air quality has been linked to a wide range of health issues, including SIDS, lung cancer, and chronic obstructive pulmonary disease (COPD). Air pollution is also linked to low birth weight.

One2019 study found that people exposed to high levels of air pollutants in the early and late states of pregnancy were more likely to have babies with lower birth weights, or with preterm births, than their non-exposed peers.

Water and Sanitation

According to the Centers for Disease Control and Prevention, an estimated 780 million people worldwide don’t have access to safe drinking water, and a jaw-dropping 1.7 billion (or roughly a fifth of Earth’s population) lack adequate sanitation services like clean bathrooms.

The simple act of filtering and chlorinating water systems in the United States has resulted in significant declines in once-common diseases like typhoid. Historically, clean water is responsible for the bulk of the decline in childhood mortality in the country.

Toxic Substances and Hazardous Wastes

Toxicology—that is, the area of science devoted to understanding how chemicals and substances can affect people and their surroundings—is an important field in environmental health. Many of the materials needed to advance industries and technology, like heavy metals or even some plastics, can also hurt the human body and even lead to serious medical conditions.

The Flint, Michigan, water crisis is an example of lead poisoning effects in a community that can lead to long-term health complications, including brain damage in children. Economically disadvantaged kids are often most affected.

The Flint crisis, which exposed more than 100,000 people to unsafe lead levels in drinking water, was a prime example of how environmental health issues often hurt those whose health status is already most at risk.

Homes and Communities

Home and neighborhoods are at the core of environmental health. When a neighborhood has a lot of violence, for example, families or older people might not go outside to exercise. When roads aren't properly maintained, it can result in more car crashes. When sidewalks are in poor condition, people may avoid walking for fear of accidents.

An emerging field of environmental health is that of food access. In neighborhoods without full-service grocery stores, people rely on convenience stores, gas stations, and fast food restaurants. This limits fresh produce options—a vital part of a healthy diet. These food deserts contribute to health disparities for low-income and minority populations especially.

Environmental health professionals are urging communities to establish public gardens where residents can grow and harvest their own fresh produce, improve access to public transportation to full-service grocery stores and farmers markets, and change zoning laws to incentivize retailers to offer healthier food options.

Infrastructure and Surveillance 

A primary piece of any public health strategy is information to identify risks and guide the resources and responses to prevent them. This includes investigating and responding to diseases—a field called epidemiology—as well as screening for hazards and establishing surveillance programs.

Surveillance activities involve either going out and looking for particular health concerns (active surveillance) or by asking professionals in other fields, such as medicine or agriculture, to alert environmental health agencies when they encounter them (passive surveillance).

An example of this in action is mosquito surveillance and abatement activities. These programs test mosquitoes for certain things, including the presence of dangerous infections like Zika virus, as well as monitor populations to ensure control measures are working. This information can help health officials know what to watch for in doctors' offices, direct local governments on where and how best to spray for mosquitoes, and alert the public if a mosquito-borne illness is spreading in the area.

Global Environmental Health

In the coming decades, environmental health professionals are bracing for a warmer, wetter climate that will likely prompt or exacerbate threats to public health across the globe.

Disease-carrying mosquitoes can live in areas previously too cold for them to survive, upping the number of people impacted by vector-borne illnesses like dengue and malaria. As sea levels rise, whole coastal cities and island nations face flood risks and disease due to displacement.

Even though health outcomes have improved significantly over the past century—in wealthy nations like the United States in particular—environmental hazards and infectious diseases know no geopolitical boundaries. People today are traveling farther and more often than ever before, and conflicts in areas like Syria, Afghanistan, and South Sudan cause millions to flee their homes.

These increases in cross-border and cross-continental movements have the potential to threaten disease prevention efforts and overextend existing infrastructure. That's why it's crucial that countries look beyond their borders to improve the health of the global population overall.

How You Can Help Protect and Improve Environmental Health

Environmental health is supported by trained experts who assess nutrition and community health, test water for heavy metals, and do research on how rising heat might change where insects are likely to spread disease. They develop laws, policies, and programs at all levels of government.

And while environmental health doesn't focus on individual impacts and footprints, there's much you can do to help. Consider protecting environmental health and safety by:

• Improving air quality. You can ride your bike, take mass transportation, or work from home instead of driving a car to and from work.
• Testing for toxins. You can test for radon gas, lead paint, or heavy metal exposure in pipes to prevent toxicity. Don't forget your cooking stove, which can be a source of indoor air pollution.
• Cooling your home. You can plant trees, install roofs designed for cooling, and make lifestyle choices (like closing off rooms or running certain appliances after dark) to limit heat impacts.
• Promoting healthy food choices. Plant gardens, shop at local farmer's markets, join a food co-op, and consider eating less meat when opting for a diet that's friendlier to environmental health.

Keep in mind that visibility helps to drive environmental health policy. Talk with your government and local businesses about investing in environmental health to ensure every neighbor has the chance to live, work, and play in a healthy and safe community.

Summary

Environmental health professionals focus on factors like industrial air pollution, water quality, healthy food access, and safe housing that impact public health. In many cases, these factors (unlike the personal risk of genetics, for example) are preventable or can be changed to improve public health and overall health equity.

Most communities in the United States are served by environmental health agencies, whether at the local and state level or through federal authorities. You can help to improve environmental health by working closely with these professionals, local businesses, and other stakeholders.

But there's much you can do personally to make lifestyle changes, like limiting plastic waste and reducing energy use, that can limit environmental health risk both for you and the planet.