Environmental health

Conceptual map illustrating the connections among nonhuman nature, ecosystem services, environmental ethics, environmental justice, and public health
Environmental health indicator (2016). It consists of three categories: health impacts, air quality, and water and sanitation. The health impacts category includes the environmental risk exposure indicator.

Environmental health is the branch of public health concerned with all aspects of the natural and built environment affecting human health. To effectively control factors that may affect health, the requirements that must be met to create a healthy environment must be determined.[1] The major sub-disciplines of environmental health are environmental science, toxicology, environmental epidemiology, and environmental and occupational medicine.[2]

Definitions

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WHO definitions

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Environmental health was defined in a 1989 document by the World Health Organization (WHO) as: Those aspects of human health and disease that are determined by factors in the environment.[3] It is also referred to as the theory and practice of accessing and controlling factors in the environment that can potentially affect health.[4]

A 1990 WHO document states that environmental health, as used by the WHO Regional Office for Europe, "includes both the direct pathological effects of chemicals, radiation and some biological agents, and the effects (often indirect) on health and well being of the broad physical, psychological, social and cultural environment, which includes housing, urban development, land use and transport."[5]

As of 2016, the WHO website on environmental health states that "Environmental health addresses all the physical, chemical, and biological factors external to a person, and all the related factors impacting behaviours. It encompasses the assessment and control of those environmental factors that can potentially affect health. It is targeted towards preventing disease and creating health-supportive environments. This definition excludes behaviour not related to environment, as well as behaviour related to the social and cultural environment, as well as genetics."[6]

The WHO has also defined environmental health services as "those services which implement environmental health policies through monitoring and control activities. They also carry out that role by promoting the improvement of environmental parameters and by encouraging the use of environmentally friendly and healthy technologies and behaviors. They also have a leading role in developing and suggesting new policy areas."[7][8]

Other considerations

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The term environmental medicine may be seen as a medical specialty, or branch of the broader field of environmental health.[9][10] Terminology is not fully established, and in many European countries they are used interchangeably.[11]

Children's environmental health is the academic discipline that studies how environmental exposures in early life—chemical, biological, nutritional, and social—influence health and development in childhood and across the entire human life span.[12]

Other terms referring to or concerning environmental health include environmental public health and health protection.[13]

Disciplines

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Five basic disciplines generally contribute to the field of environmental health: environmental epidemiology, toxicology, exposure science, environmental engineering, and environmental law. Each of these five disciplines contributes different information to describe problems and solutions in environmental health. However, there is some overlap among them.

  • Environmental epidemiology studies the relationship between environmental exposures (including exposure to chemicals, radiation, microbiological agents, etc.) and human health. Observational studies, which simply observe exposures that people have already experienced, are common in environmental epidemiology because humans cannot ethically be exposed to agents that are known or suspected to cause disease. While the inability to use experimental study designs is a limitation of environmental epidemiology, this discipline directly observes effects on human health rather than estimating effects from animal studies.[14] Environmental epidemiology is the study of the effect on human health of physical, biologic, and chemical factors in the external environment, broadly conceived. Also, examining specific populations or communities exposed to different ambient environments, Epidemiology in our environment aims to clarify the relationship that exist between physical, biologic or chemical factors and human health.[15]
  • Toxicology studies how environmental exposures lead to specific health outcomes, generally in animals, as a means to understand possible health outcomes in humans. Toxicology has the advantage of being able to conduct randomized controlled trials and other experimental studies because they can use animal subjects. However, there are many differences in animal and human biology, and there can be a lot of uncertainty when interpreting the results of animal studies for their implications for human health.[16]
  • Exposure science studies human exposure to environmental contaminants by both identifying and quantifying exposures. Exposure science can be used to support environmental epidemiology by better describing environmental exposures that may lead to a particular health outcome, identify common exposures whose health outcomes may be better understood through a toxicology study, or can be used in a risk assessment to determine whether current levels of exposure might exceed recommended levels. Exposure science has the advantage of being able to very accurately quantify exposures to specific chemicals, but it does not generate any information about health outcomes like environmental epidemiology or toxicology.[17]
  • Environmental engineering applies scientific and engineering principles for protection of human populations from the effects of adverse environmental factors; protection of environments from potentially deleterious effects of natural and human activities; and general improvement of environmental quality.[18]
  • Environmental law includes the network of treaties, statutes, regulations, common and customary laws addressing the effects of human activity on the natural environment.[19][20]

Information from epidemiology, toxicology, and exposure science can be combined to conduct a risk assessment for specific chemicals, mixtures of chemicals or other risk factors to determine whether an exposure poses significant risk to human health (exposure would likely result in the development of pollution-related diseases). This can in turn be used to develop and implement environmental health policy that, for example, regulates chemical emissions, or imposes standards for proper sanitation.[21] Actions of engineering and law can be combined to provide risk management to minimize, monitor, and otherwise manage the impact of exposure to protect human health to achieve the objectives of environmental health policy.

Concerns

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Overview of main health effects on humans from some common types of pollution[22][23][24]
FEMA/EPA Hazardous Materials Team removing hazards left in the wake of Hurricane Katrina, 2005
Lecture of Joyeeta Gupta (University of Amsterdam) on environmental health

Environmental health addresses all human-health-related aspects of the natural environment and the built environment. Environmental health concerns include:

According to recent estimates, about 5 to 10% of disability-adjusted life years (DALYs) lost are due to environmental causes in Europe. By far the most important factor is fine particulate matter pollution in urban air.[25] Similarly, environmental exposures have been estimated to contribute to 4.9 million (8.7%) deaths and 86 million (5.7%) DALYs globally.[26] In the United States, Superfund sites created by various companies have been found to be hazardous to human and environmental health in nearby communities. It was this perceived threat, raising the specter of miscarriages, mutations, birth defects, and cancers that most frightened the public.[27]

Air quality

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Air quality includes ambient outdoor air quality and indoor air quality. Large concerns about air quality include environmental tobacco smoke, air pollution by forms of chemical waste, and other concerns.

Outdoor air quality

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Air pollution is globally responsible for over 6.5 million deaths each year.[28] Air pollution is the contamination of an atmosphere due to the presence of substances that are harmful to the health of living organisms, the environment or climate.[29] These substances concern environmental health officials since air pollution is often a risk-factor for diseases that are related to pollution, like lung cancer, respiratory infections, asthma, heart disease, and other forms of respiratory-related illnesses.[30] Reducing air pollution, and thus developing air quality, has been found to decrease adult mortality.[31]

A Mumbai factory releasing air pollution.

Common products responsible for emissions include road traffic, energy production, household combustion, aviation and motor vehicles, and other forms of pollutants.[32][33] These pollutants are responsible for the burning of fuel, which can release harmful particles into the air that humans and other living organisms can inhale or ingest.[34]

Air pollution is associated with adverse health effects like respiratory and cardiovascular diseases, cancer, related illnesses, and even death.[35] The risk of air pollution is determined by the pollutant's hazard and the amount of exposure that affects a person.[36] For example, a child who plays outdoor sports will have a higher likelihood of outdoor air pollution exposure than an adult who tends to spend more time indoors, whether at work or elsewhere.[36] Environmental health officials work to detect individuals who are at higher risks of consuming air pollution, work to decrease their exposure, and detect risk factors present in communities.[37]

However, as shown in research by Ernesto, Sánchez-Triana in the case of Pakistan. After identifying the main sources of air pollution, such as mobile sources, such as heavy-duty vehicles and motorized 2–3 wheelers; stationary sources, such as power plants and burning of waste; and natural dust. The country implemented a clean air policy to reduce the road transport sector, which is responsible for 85% of particulate matter of less than 2.5 microns (PM2.5) total emissions and 72% of particulate matter of less than 10 microns (PM10)[38] Most successful policies were:

  • Improving fuel quality by reducing the sulfur content in diesel
  • Converting diesel minibuses and city delivery vans to compressed natural gas (CNG)
  • Installing diesel oxidation catalysts (DOCs) on existing large buses and trucks
  • Converting existing two-stroke rickshaws to four-stroke CNG engines
  • Introducing low-sulfur fuel oil (1% sulfur) to major users located in Karachi[38]

Indoor air quality

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Household air pollution contributes to diseases that kill almost 4.3 million people every year.[39] Indoor air pollution contributes to risk factors for diseases like heart disease, pulmonary disease, stroke, pneumonia, and other associated illnesses.[39] For vulnerable populations, such as children and elderly populations, who spend large amounts of their time indoors or indoor air quality can be dangerous.[40]

Burning fuels like coal or kerosene inside homes can cause dangerous chemicals to be released into the air.[39] Dampness and mold in houses can cause diseases, but few studies have been performed on mold in schools and workplaces.[41] Environmental tobacco smoke is considered to be a leading contributor to indoor air pollution since exposure to second and third-hand smoke is a common risk factor.[42] Tobacco smoke contains over 60 carcinogens, where 18% are known human carcinogens.[43] Exposure to these chemicals can lead to exacerbation of asthma, the development of cardiovascular diseases and cardiopulmonary diseases, and an increase in the likelihood of cancer development.[44]

Climate change and its effects on health

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Climate change makes extreme weather events more likely, including ozone smog events, dust storms, and elevated aerosol levels, all due to extreme heat, drought, winds, and rainfall.[45][46] These extreme weather events can increase the likelihood of undernutrition, mortality, food insecurity, and climate-sensitive infectious diseases in vulnerable populations.[47] The effects of climate change are felt by the whole world, but disproportionately affect disadvantaged populations who are subject to climate change vulnerability.[48]

Water runoff in Maryland, USA.

Climate impacts can affect exposure to water-borne pathogens through increased rates of runoff, frequent heavy rains, and the effects of severe storms.[49] Extreme weather events and storm surges can also exceed the capacity of water infrastructure, which can increase the likelihood that populations will be exposed to these contaminants.[49][50] Exposure to these contaminants are more likely in low-income communities, where they have inadequate infrastructure to respond to climate disasters and are less likely to recover from infrastructure damage as quickly.[51]

Problems like the loss of homes, loved ones, and previous ways of life, are often what people face after a climate disaster occurs. These events can lead to vulnerability in the form of housing affordability stress, lower household income, lack of community attachment, grief, and anxiety around another disaster occurring.[48]

Environmental racism

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Certain groups of people can be put at a higher risk for environmental hazards like air, soil and water pollution. This often happens due to marginalization, economic and political processes, and racism. Environmental racism uniquely affects different groups globally, however generally the most marginalized groups of any region are affected. These marginalized groups are frequently put next to pollution sources like major roadways, toxic waste sites, landfills, and chemical plants.[52] In a 2021 study, it was found that racial and ethnic minority groups in the United States are exposed to disproportionately high levels of particulate air pollution.[53] Racial housing policies that exist in the United States continue to exacerbate racial minority exposure to air pollution at a disproportionate rate, even as overall pollution levels have declined.[53] Likewise, in a 2022 study, it was shown that implementing policy changes that favor wealth redistribution could double as climate change mitigation measures.[54] For populations who are not subject to wealth redistribution measures, this means more money will flow into their communities while climate effects are mitigated.[53][54]

Noise pollution

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Airplane flying over a residential district.

Noise pollution is usually environmental, machine-created sound that can disrupt activities or communication between humans and other forms of life.[citation needed] Exposure to persistent noise pollution can cause numerous ailments like hearing impairment, sleep disturbances, cardiovascular problems, annoyance, problems with communication and other diseases.[55] For American minorities that live in neighborhoods of low socioeconomic status, they often experience higher levels of noise pollution compared to their higher socioeconomic counterparts.[56]

Noise pollution can cause or exacerbate cardiovascular diseases, which can further attribute to a larger range of diseases, increase stress levels, and cause sleep disturbances.[56] Noise pollution is also responsible for many reported cases of hearing loss, tinnitus, and other forms of hypersensitivity(stress/irritability) or lack thereof to sound(present or subconscious from continuous exposure).[56] These conditions can be dangerous to children and young adults who consistently experience noise pollution, as many of these conditions can develop into long-term problems, including physical and mental health issues.[56]

Children who attend school in noisy traffic zones have shown to have 15% lower memory development compared to other students who attended schools in quiet traffic zones, according to a Barcelona study.[57] This is consistent with research that suggests that children who are exposed to regular aircraft noise "have inadequate performance on standardised achievement tests."[58]

Exposure to persistent noise pollution can cause one to develop hearing impairments, like tinnitus or impaired speech discrimination.[59] One of the largest factors in worsened mental health due to noise pollution is annoyance.[60][61] Annoyance due to environmental factors has been found to increase stress reactions and overall feelings of stress among adults.[55] The level of annoyance felt by an individual varies, but contributes to worsened mental health significantly.[61]

Noise exposure also contributes to sleep disturbances, which can cause daytime sleepiness and an overall lack of sleep, which contributes to worsened health.[61] Daytime sleepiness has been linked to several reports of declining mental health and other health issues, job insecurities and further social and environmental factors declining.

Safe drinking water

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Well installation for safe drinking water.

Access to safe drinking water is considered a "basic human need for health and well-being" by the United Nations.[62] According to their reports, over 2 billion people worldwide live without access to safe drinking water.[63] In 2017, almost 22 million Americans drank from water systems that were in violation of public health standards.[64] Globally, over 2 billion people drink feces-contaminated water, which poses the greatest threat to drinking water safety.[65] Contaminated drinking water could transmit diseases like cholera, dysentery, typhoid, diarrhea and polio.[65]

Harmful chemicals in drinking water can negatively affect health. Unsafe water management practices can increase the prevalence of water-borne diseases and sanitation-related illnesses.[66][67] Inadequate disinfecting of wastewater in industrial and agricultural centers can also infect hundreds of millions of people with contaminated water.[65] Chemicals like fluoride and arsenic can benefit humans when the levels of these chemicals are controlled;but other, more dangerous chemicals like lead and metals can be harmful to humans.[65]

In America, communities of color can be subject to poor-quality water.[68] In communities in America with large Hispanic and black populations, there is a correlated rise in SDWA health violations.[68] Populations who have experienced lack of safe drinking water, like populations in Flint, Michigan, are more likely to distrust tap water in their communities.[51] Populations to experience this are commonly low-income, communities of color.[69]

Hazardous materials management

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Hazardous materials management, including hazardous waste management, contaminated site remediation, the prevention of leaks from underground storage tanks and the prevention of hazardous materials releases to the environment and responses to emergency situations resulting from such releases. When hazardous materials are not managed properly, waste can pollute nearby water sources and reduce air quality.[70]

According to a study done in Austria, people who live near industrial sites are "more often unemployed, have lower educations levels, and are twice as likely to be immigrants.[71] With the interest of environmental health in mind, the Resource Conservation and Recovery Act was passed in the United States in 1976 that covered how to properly manage hazardous waste.[72]

There are a variety of occupations that work with hazardous materials and help manage them so that everything is disposed of correctly. These professionals work in various sectors, including government agencies, private industry, consulting firms, and non-profit organizations, all with the common goal of ensuring the safe handling of hazardous materials and waste. These positions include but are not limited to Environmental Health and Safety Specialists, Waste collectors, Medical Professionals, and Emergency Responders.[73] Handling waste, especially hazardous materials is considered one of the most dangerous occupations in the world.[74] Often, these workers may not have all of information about the specific hazardous materials they encounter, making their jobs even more dangerous. The sudden exposure to materials they are not properly prepared to handle can lead to severe consequences.[75] This emphasizes the importance of training, safety protocols, and the use of personal protective equipment for those working with hazardous waste.

Microplastic pollution

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Humans are exposed to toxic chemicals and microplastics at all stages in the plastics life cycle

Microplastics effects on human health are of growing concern and an area of research. The tiny particles known as microplastics (MPs), have been found in various environmental and biological matrices, including air, water, food, and human tissues. Microplastics, defined as plastic fragments smaller than 5 mm, and even smaller particles such as nanoplastics (NP), particles smaller than 1000 nm in diameter (0.001 mm or 1 μm), have raised concerns impacting human health.[76][77] The pervasive presence of plastics in our environment has raised concerns about their long-term impacts on human health. While visible pollution caused by larger plastic items is well-documented, the hidden threat posed by nanoplastics—tiny particles less than 1 µm in diameter—remains under-explored. These particles originate from the degradation of larger plastics and are now found in various environmental matrices, including water, soil, and air. Given their minute size, nanoplastics can penetrate biological barriers and accumulate in human tissues, potentially leading to adverse health effects.[78][79]

Plastics continue to accumulate in landfills and oceans, leading to pollution that negatively impacts both human and animal health. Notably, microplastics and nanoplastics are now ubiquitous, infiltrating our food chain and water supplies. Studies indicate that humans ingest significant amounts of microplastics daily through food, especially seafood[80] and inhalation, with estimates ranging from 39,000 to 52,000 particles per person annually[81]. Additionally, the presence of microplastics in human feces suggests widespread exposure and absorption [82]. In scientific literature, combined microplastics and nanoplastics are referred to as MNPs or NMPs, or NMPPs for nano-and microplastic particles.

Understanding the sources and health effects of nanoplastics is crucial for developing effective public health policies. As plastics are an integral part of modern life, balancing their benefits with the associated health risks is essential. This research aims to provide evidence-based recommendations to mitigate the adverse health effects of nanoplastics, thereby informing future regulatory and policy decisions. The increasing presence of nanoplastics in the environment has raised concerns about their potential impacts on human health. Research has shown that nanoplastics can penetrate biological barriers, induce toxicity, and accumulate in organs, leading to various health issues [83]. Nanoplastics have been found in drinking water, food, and air, making human exposure ubiquitous[84].

Soil pollution

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Contaminated or polluted soil directly affects human health through direct contact with soil or via inhalation of soil contaminants that have vaporized; potentially greater threats are posed by the infiltration of soil contamination into groundwater aquifers used for human consumption, sometimes in areas apparently far removed from any apparent source of above-ground contamination. Toxic metals can also make their way up the food chain through plants that reside in soils containing high concentrations of heavy metals.[85] This tends to result in the development of pollution-related diseases.

Most exposure is accidental, and exposure can happen through:[86]

  • Ingesting dust or soil directly
  • Ingesting food or vegetables grown in contaminated soil or with foods in contact with contaminants
  • Skin contact with dust or soil
  • Vapors from the soil
  • Inhaling clouds of dust while working in soils or windy environments
However, some studies estimate that 90% of exposure is through eating contaminated food.[86]

Information and mapping

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The Toxicology and Environmental Health Information Program (TEHIP)[87] is a comprehensive toxicology and environmental health web site, that includes open access to resources produced by US government agencies and organizations, and is maintained under the umbrella of the Specialized Information Service at the United States National Library of Medicine. TEHIP includes links to technical databases, bibliographies, tutorials, and consumer-oriented resources. TEHIP is responsible for the Toxicology Data Network (TOXNET),[88] an integrated system of toxicology and environmental health databases including the Hazardous Substances Data Bank, that are open access, i.e. available free of charge. TOXNET was retired in 2019.[89]

There are many environmental health mapping tools. TOXMAP is a geographic information system (GIS) from the Division of Specialized Information Services[90] of the United States National Library of Medicine (NLM) that uses maps of the United States to help users visually explore data from the United States Environmental Protection Agency's (EPA) Toxics Release Inventory and Superfund Basic Research Programs. TOXMAP is a resource funded by the US federal government. TOXMAP's chemical and environmental health information is taken from the NLM's Toxicology Data Network (TOXNET)[91] and PubMed, and from other authoritative sources.

Environmental health profession

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Environmental health professionals may be known as environmental health officers, public health inspectors, environmental health specialists or environmental health practitioners. Researchers and policy-makers also play important roles in how environmental health is practiced in the field. In many European countries, physicians and veterinarians are involved in environmental health.[92] In the United Kingdom, practitioners must have a graduate degree in environmental health and be certified and registered with the Chartered Institute of Environmental Health or the Royal Environmental Health Institute of Scotland.[93] In Canada, practitioners in environmental health are required to obtain an approved bachelor's degree in environmental health along with the national professional certificate, the Certificate in Public Health Inspection (Canada), CPHI(C).[94] Many states in the United States also require that individuals have a bachelor's degree and professional licenses to practice environmental health.[95] California state law defines the scope of practice of environmental health as follows:[96]

"Scope of practice in environmental health" means the practice of environmental health by registered environmental health specialists in the public and private sector within the meaning of this article and includes, but is not limited to, organization, management, education, enforcement, consultation, and emergency response for the purpose of prevention of environmental health hazards and the promotion and protection of the public health and the environment in the following areas: food protection; housing; institutional environmental health; land use; community noise control; recreational swimming areas and waters; electromagnetic radiation control; solid, liquid, and hazardous materials management; underground storage tank control; onsite septic systems; vector control; drinking water quality; water sanitation; emergency preparedness; and milk and dairy sanitation pursuant to Section 33113 of the Food and Agricultural Code.

The environmental health profession had its modern-day roots in the sanitary and public health movement of the United Kingdom. This was epitomized by Sir Edwin Chadwick, who was instrumental in the repeal of the poor laws, and in 1884 was the founding president of the Association of Public Sanitary Inspectors, now called the Chartered Institute of Environmental Health.[97]

See also

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References

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