Helena Joyce
Environmental pollution is a significant health risk, causing around 12 million deaths annually. Air pollution is the most prominent environmental health hazard, causing 6.5 million deaths per year. It is a mix of hazardous substances from both human-made and natural sources. Human-made sources include vehicle emissions, fuel oils, natural gas, and by-products of manufacturing and power generation. Natural sources include smoke from wildfires, ash and gases from volcanic eruptions, and methane emissions. Air pollution can cause respiratory diseases, heart disease, and cancer. It can also lead to oxidative stress and inflammation in human cells, which may lay the foundation for chronic diseases. Environmental pollution also affects water and soil, with pesticides, heavy metals, and plastic additives contaminating these environments and disturbing respiratory and cardiovascular health. Vulnerable groups such as children, the elderly, pregnant women, and people with low incomes are at higher risk of health problems related to pollution.
| Characteristics | Values |
|---|---|
| Environmental pollutants | Particle pollution, ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead |
| Impact on human health | Respiratory diseases, heart disease, cancer, stroke, chronic obstructive pulmonary disease, inflammation, oxidative stress, immunosuppression, and mutagenicity |
| Other impacts | Acid rain, global warming, the greenhouse effect, climate changes, and antimicrobial resistance |
| Populations at higher risk | Children, elderly, pregnant women, and people with low incomes |
| Number of deaths per year | 9-12 million |
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What You'll Learn
Air pollution and respiratory diseases
Air pollution is defined as the presence of one or more contaminants in the atmosphere, such as dust, fumes, gas, mist, odour, smoke or vapour, in quantities and durations that can be harmful to human health. The main pathway of exposure from air pollution is through the respiratory tract.
Air pollution has been linked to a variety of respiratory health effects, including respiratory symptoms such as coughing, phlegm, and wheezing. It can also cause acute, reversible decrements in pulmonary function, inflammation of the airways and lungs, bronchial hyper-reactivity, acute phase reactions, respiratory infections, and a decrease in lung function growth in children. Studies have also shown that exposure to air pollution can cause chronic loss of pulmonary function in adults, the development of asthma, and premature mortality in people with chronic lung disease.
People with pre-existing respiratory diseases are at a greater risk of potential respiratory-related health effects due to short-term particle exposure. Fine particulate matter exposure has been linked to decrements in lung function growth in children and increased respiratory symptoms. COPD, or chronic obstructive pulmonary disease, is the most common cause of respiratory preventable deaths attributable to air pollution exposure, followed by asthma. Exposure to air pollution can also aggravate pre-existing conditions like asthma or COPD.
Air pollution is a major health concern for European residents. In 2021, EU member states saw 253,000 deaths from exposure to PM2.5, 52,000 deaths from exposure to NO2, and 22,000 deaths from short-term exposure to O3. These deaths could have been avoided by meeting WHO recommendations on air pollution. The European Commission has set the interim 2030 goal of reducing the number of premature deaths caused by PM2.5 by at least 55% compared to 2005 levels.
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Water pollution and human health
Water pollution is a serious environmental issue that can have detrimental effects on human health. It occurs when water becomes contaminated, typically by chemicals or microorganisms, making it toxic to humans and leading to infections and other health issues. According to the United Nations (UN), 2.2 billion people lacked access to safe drinking water services in 2022, and over 2 billion people live in countries with high levels of water stress, where the available water supply is insufficient.
Water pollution is caused by various human activities and industrial processes. One significant contributor to water pollution is industrialization and agricultural activities, which release toxic chemicals, organic and inorganic substances, toxic solvents, and volatile organic compounds into water sources. These pollutants include pesticides, fertilizers, and heavy metals, which can have severe health consequences if ingested. Additionally, untreated or partially treated wastewater is often used for irrigation in water-scarce regions, leading to land and food pollution and further contaminating water sources.
The impact of water pollution on human health is significant and far-reaching. One of the most common diseases caused by water pollution is diarrhea, which is transmitted by enteroviruses in contaminated water. Contaminated water can also harbor dangerous bacteria, leading to cholera, dysentery, typhoid, hepatitis A, and polio. Furthermore, the consumption of polluted water has been linked to more severe health issues such as cancer and cardiovascular conditions.
Microplastics, formed from the breakdown of plastic pollution in water, pose another threat to human health. These tiny plastic fragments can be ingested through drinking water or the consumption of contaminated seafood. While the specific effects are still under research, initial studies indicate that microplastics may trigger oxidative stress, inflammatory reactions, and metabolic disorders in humans.
The lack of access to safe drinking water and the prevalence of water pollution disproportionately affect people in developing countries and regions with inadequate sanitation and wastewater treatment infrastructure. China, for example, faces significant water pollution challenges due to rapid industrialization, urbanization, and insufficient investment in water treatment infrastructure. As a result, a substantial portion of the population consumes drinking water contaminated with animal and human excreta, posing serious health risks.
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Soil pollution and its health impacts
Soil pollution is a significant threat to human health, and it is on the rise globally, particularly affecting the most vulnerable populations. Healthy soil is foundational to human health. It is necessary for growing crops, providing food, and sustaining populations. Soil pollution can reduce crop yields and make food unsuitable for human consumption, thereby affecting food security. Soil pollution is caused by heavy metals, organic chemicals such as pesticides, biological pathogens, and micro/nanoplastic particles. These pollutants can enter the soil through industrial emissions, agricultural practices, and deforestation.
The health impacts of soil pollution are wide-ranging. Soil pollution has been linked to an increased risk of cardiovascular disease, with inorganic arsenic exposure from rice intake associated with a higher risk of cardiovascular disease. Soil pollution can also lead to food crop contamination and disease, with pollutants accumulating in the soil above critical thresholds, posing a significant risk to human health. Human exposure to soil pollution is estimated to contribute to more than 500,000 premature deaths globally each year, with vulnerable groups such as children and the elderly being particularly affected.
Moreover, soil pollution can have long-term impacts on human health, and the relationship between exposure to soil pollution and disease is complex and determined by various factors. These factors include the type and concentration of contaminants, the route of exposure (inhalation, ingestion, or dermal absorption), individual vulnerabilities, and community specificity. The negative impact of soil pollution on human health may be underestimated due to a lack of information and investment in pollution identification, quantification, and risk assessment in many countries.
Additionally, soil pollution can have indirect effects on human health by degrading ecosystems and critical ecological services. For example, soil pollution can impact biodiversity, water quality, and climate change mitigation. It can also generate resistance in soil microorganisms, reducing the potential to produce new medicines and causing new health problems in humans and animals. Overall, soil pollution is a serious issue that requires attention and efforts to reduce its impact on human health and the environment.
In conclusion, soil pollution is a growing concern that poses significant risks to human health. It affects food security, contributes to premature deaths, and has long-term impacts on vulnerable populations. The complex relationship between soil pollution and health outcomes underscores the need for precautionary measures, improved monitoring, and global collaboration to address this issue effectively. By understanding the health impacts of soil pollution, we can work towards mitigating its effects and protecting the well-being of vulnerable communities.
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Climate change and health
Climate change poses a significant threat to human health, impacting various aspects of our physical, mental, and social well-being. Firstly, it increases the frequency and intensity of extreme weather events, such as storms, heatwaves, floods, and droughts. These events have direct and indirect health consequences, including increased risk of injuries, respiratory and cardiovascular diseases, and premature deaths. Vulnerable populations, including children, the elderly, pregnant women, and individuals with pre-existing health conditions, are at a higher risk of experiencing adverse health effects from air pollution. Additionally, climate change affects the spread of infectious diseases, with changes observed in the incidence of malaria, diarrhoea, and vector-borne diseases like Lyme disease and West Nile virus.
The changing climate also impacts our mental health and social determinants of health. It can lead to psychological distress, particularly in vulnerable communities, and contribute to social issues such as livelihood disruptions, inequality, and limited access to healthcare and social support. Low-income countries and small island developing states often bear the brunt of these impacts, experiencing harsh health consequences despite contributing minimally to global emissions.
Furthermore, climate change affects essential resources for human health, including clean air, water, and soil. Air pollution, influenced by factors such as desert dust storms and household emissions, poses a significant risk to respiratory health and is linked to various diseases. It is crucial to reduce exposure to ambient and household air pollution to mitigate these health risks.
The health impacts of climate change are already being felt globally, and the situation is expected to worsen without urgent action. The Intergovernmental Panel on Climate Change (IPCC) has warned that climate risks are accelerating and will become more severe, making adaptation more challenging. Reducing greenhouse gas emissions through sustainable choices in transport, food production, and energy use can significantly benefit health by reducing air pollution and mitigating climate change.
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Lead poisoning and its health effects
Lead is a naturally occurring toxic metal found in the Earth's crust. Its widespread use, especially in mining, burning fossil fuels, manufacturing, and recycling activities, has resulted in extensive environmental contamination. Lead poisoning occurs when lead builds up in the body over months or years, often going undetected initially. Even small amounts of lead can cause serious health problems, and there is no level of exposure that is considered safe.
Young children are particularly vulnerable to lead poisoning, with those under 6 years of age being most at risk. This is because they are more likely to be exposed to lead through hand-to-mouth activities and their developing bodies absorb more lead than adults. Lead poisoning can severely affect children's mental and physical development, causing behavioural problems, learning disabilities, and seizures. In some cases, lead poisoning has resulted in fatalities.
Pregnant women are also at risk of lead poisoning, as lead stored in the bones can be released into the bloodstream during pregnancy, posing a threat to the developing fetus. Lead exposure during pregnancy has been linked to reduced fetal growth and preterm birth.
While adults are generally less susceptible to lead poisoning, long-term exposure can still cause serious health issues. These include an increased risk of high blood pressure, cardiovascular problems, and kidney damage. Additionally, certain occupations put adults at a higher risk of lead exposure, such as working with batteries, home renovations, or auto repair.
To prevent lead poisoning, individuals can take simple precautions such as regularly washing hands and toys, cleaning dusty surfaces, and avoiding lead-contaminated environments. Eating a healthy and nutritious diet may also help lower lead absorption.
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