Helena Joyce
Air pollution is a familiar environmental health hazard, with the World Health Organization (WHO) reporting that 99% of people breathe air that exceeds its guideline limits for pollutants. The health impacts of air pollution depend on the types and concentrations of pollutants in the air, but both short- and long-term exposure to air pollutants can cause a variety of health problems. Air pollution is linked to respiratory issues such as aggravated asthma, increased risk of respiratory infections, and adverse respiratory effects including increased asthma symptoms and lung disease. It is also associated with cardiovascular issues such as abnormal heartbeats, heart attacks, and heart disease. Furthermore, air pollution is connected to an increased risk of certain types of cancer, including lung cancer and breast cancer. Aside from health impacts, air pollution also affects biodiversity, ecosystems, and economic activity.
| Characteristics | Values |
|---|---|
| Health effects | Cancer, cardiovascular disease, respiratory diseases, diabetes mellitus, obesity, reproductive, neurological, and immune system disorders, asthma, strokes, heart attacks, dementia, low birth weight, stillbirths, miscarriages, lung disease, abnormal heartbeats, COPD, chronic bronchitis, lung cancer, birth defects, behavioural problems, learning deficits, lowered IQ, high blood pressure, reduced lung function, respiratory infections, aggravated asthma |
| Global deaths | 7 million per year |
| Global temperature increases | Super pollutants are responsible for half of current increases |
| Global crop yield losses | 3-16% |
| Global economic costs | $6 trillion in annual health costs |
| Global work days lost | 1.2 billion per year |
| US economic benefits | Every $1 spent on air pollution control yields an estimated $30 in economic benefits |
| US Clean Air Act | Established in 1970 |
| US air quality standards | 9% of countries have standards for particulate matter pollution (PM2.5) that meet World Health Organization (WHO) guidelines |
| US air quality data | Only a quarter of countries provide full and easy public access |
| US air pollution reduction | The number of people exposed to dangerously high levels of PM2.5 could be halved by 2040 with targeted policy action |
| China air pollution reduction | Air pollution cut by around half since 2014, with two years of average life expectancy regained |
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What You'll Learn
- Air pollution is linked to cancer, cardiovascular and respiratory diseases, diabetes, obesity, and neurological disorders
- Pollution causes 8.1 million premature deaths annually, with 99% of people breathing polluted air
- Indoor air pollution can be caused by wood smoke, radon, carbon monoxide, and volatile organic compounds
- Outdoor air pollution comes from vehicle exhaust, industrial emissions, pollen, and chemicals
- Pollution impacts vulnerable groups the most, including the young, elderly, pregnant women, and low-income communities
Air pollution is linked to cancer, cardiovascular and respiratory diseases, diabetes, obesity, and neurological disorders
Air pollution has been linked to a range of serious health issues, including cancer, cardiovascular and respiratory diseases, diabetes, obesity, and neurological disorders.
Fine particulate matter (PM2.5) is a significant contributor to air pollution and has been associated with an increased risk of cancer. Studies have found a link between exposure to PM2.5 and an elevated risk of lung, breast, liver, and pancreatic cancer. Additionally, living near major roadways has been associated with an increased risk of breast cancer for women. Other studies have also found a connection between air pollution and ovarian cancer.
Air pollution, particularly PM2.5, has been shown to exacerbate existing cardiovascular disease and contribute to the development of the disease. Evidence suggests that exposure to PM2.5 over a short period of a few hours to weeks can trigger cardiovascular events such as heart attacks and even lead to death. Populations with underlying cardiovascular conditions or those who have previously experienced cardiovascular events are at an increased risk of health effects related to PM2.5 exposure.
The impact of air pollution on respiratory health is also significant. For example, exposure to secondhand smoke, which is a form of indoor air pollution, can cause lung cancer and lead to more frequent and severe asthma attacks.
Air pollution has also been linked to metabolic disorders such as type 2 diabetes mellitus (T2DM). Epidemiological studies have found a connection between air pollution and disturbances in glucose metabolism, insulin homeostasis, and increased blood lipid concentrations. Additionally, elderly, female, and obese individuals are more susceptible to developing T2DM under exposure to air pollution.
Lastly, air pollution has been associated with neurological disorders, including Alzheimer's disease (AD) and Parkinson's disease (PD). The neurotoxic effects of air pollution, particularly PM2.5, can lead to oxidative stress, inflammation, impairment of the blood-brain barrier, and direct harm to neuronal cells. Prolonged exposure to air pollution can alter gene expression related to the integrity and functionality of the blood-brain barrier, increasing its permeability.
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Pollution causes 8.1 million premature deaths annually, with 99% of people breathing polluted air
Air pollution is a familiar environmental health hazard. It refers to the release of pollutants into the air, which are detrimental to human health and the planet. According to the World Health Organization (WHO), air pollution is responsible for 6.7 million premature deaths annually. However, a report by UNICEF puts this figure at 8.1 million premature deaths globally in 2021, making it the second leading risk factor for death. This includes the deaths of children under five years old, with health effects such as premature birth, low birth weight, asthma, and lung disease.
The impact of air pollution on child health is striking, with a death rate in children under five in East, West, Central, and Southern Africa that is 100 times higher than in high-income countries. Overall, 99% of people currently breathe air that exceeds the WHO's guideline limits for pollutants, with those in low- and middle-income countries suffering the most. The death toll from burning fossil fuels in power generation, transportation, and industry is responsible for 3.6 million deaths, while outdoor air pollution leads to 3.3 million deaths per year.
The health effects of air pollution are wide-ranging and can include respiratory diseases, cardiovascular disease, lung cancer, reproductive problems, neurological disorders, and immune system disorders. Short-term exposure to fine particles in the air can aggravate lung disease, trigger asthma attacks, and increase the risk of respiratory infections. Over time, breathing in these fine particles increases the chances of developing chronic obstructive pulmonary disease (COPD), chronic bronchitis, and lung cancer.
Indoor air pollution is also a significant issue, with people spending approximately 90% of their time indoors. Common indoor air pollutants include radon, smoke, lead dust, carbon monoxide, and volatile organic compounds (VOCs). Biological pollutants such as mold, pollen, animal dander, and dust mites can trigger breathing problems, allergic symptoms, or asthma attacks. Tobacco smoke contains over 200 known poisons and at least 60 chemicals that can cause cancer.
The best way to control air pollution is to transition to cleaner fuels and industrial processes. The Clean Air Act in the United States, established in 1970, is crucial for reducing air pollution by regulating the emissions of harmful air pollutants.
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Indoor air pollution can be caused by wood smoke, radon, carbon monoxide, and volatile organic compounds
Indoor air pollution can be detrimental to human health and can be caused by wood smoke, radon, carbon monoxide, and volatile organic compounds (VOCs).
Wood smoke is a major contributor to fine particle pollution (PM), which is responsible for poor air quality in many areas across the United States, particularly during the winter. The particles in wood smoke can irritate the lungs, cause inflammation, affect the immune system, and increase the risk of lung infections, including SARS-CoV-2. Populations at greater risk of adverse health effects from wood smoke include children, teenagers, older adults, people with lung or heart disease, outdoor workers, those of low socioeconomic status, and new or expectant mothers.
Radon is a radioactive gas produced by the natural radioactive decay of uranium found in rocks and soils. It can also be present in water. Radon escapes from the ground into the air, where it decays and produces radioactive particles that can be deposited in the airways when inhaled. These particles can damage DNA and potentially cause lung cancer, particularly in smokers, who are at a much higher risk than non-smokers. The concentration of radon in buildings depends on factors such as local geology, the construction of the building, ventilation, and air-tightness.
Carbon monoxide (CO) is a colorless, odorless, and toxic gas that can be deadly. It is released from fuel-burning appliances, such as furnaces, stoves, fireplaces, and generators, and can cause headaches, dizziness, nausea, faintness, and even death at high levels. The effects of CO exposure can vary depending on age, overall health, and the concentration and duration of exposure.
VOCs are organic compounds that vaporize at or near room temperature and contain carbon. They are emitted by a wide range of household products, including paints, varnishes, cleaning supplies, pesticides, cosmetics, fuels, and even craft materials. Concentrations of VOCs are often significantly higher indoors compared to outdoors, and they can have adverse short-term and long-term health effects. However, the specific health effects depend on factors such as the level of exposure and the length of time exposed.
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Outdoor air pollution comes from vehicle exhaust, industrial emissions, pollen, and chemicals
Outdoor air pollution is a major environmental health hazard. It is caused by vehicle exhaust, industrial emissions, pollen, and chemicals. Vehicle exhaust releases pollutants such as carbon monoxide (CO), nitrogen dioxide (NO2), particulate matter (PM), and volatile organic compounds (VOCs). These pollutants can have serious health impacts, including respiratory and cardiovascular diseases and an increased risk of cancer. Children are particularly vulnerable to the effects of air pollution from buses and vehicles.
Industrial emissions also contribute significantly to outdoor air pollution. The combustion of fuels in the industrial sector releases nitrogen dioxide (NO2), and industrial processes produce polycyclic aromatic hydrocarbons (PAHs), which are known to be carcinogenic. Additionally, the burning of fossil fuels contributes to global warming, leading to rising temperatures and water levels, causing extreme weather events.
Pollen is another outdoor air pollutant that affects allergy sufferers. Air pollution interacts with pollen and plants, leading to longer pollen seasons and increased allergenicity. Increased air pollution, especially ozone, exacerbates the symptoms of pollen allergies.
Furthermore, chemicals released from vehicles and industrial processes contribute to outdoor air pollution. Volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) are emitted from vehicle interior materials, while hazardous chemicals released from industrial facilities can be carried by wind patterns and deposited on surfaces such as plants, soils, and surface waters.
The effects of outdoor air pollution from these sources are severe and far-reaching. It is estimated that outdoor air pollution caused 4.2 million premature deaths worldwide in 2019, with 89% of those occurring in low- and middle-income countries. Policy interventions and cleaner technologies are necessary to reduce outdoor air pollution and mitigate its detrimental impacts on human health and the environment.
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Pollution impacts vulnerable groups the most, including the young, elderly, pregnant women, and low-income communities
Air pollution is an environmental health hazard that affects everyone. However, vulnerable groups, including the young, elderly, pregnant women, and low-income communities, are impacted the most.
The Young
Children are more susceptible to the harmful effects of air pollution as they are still growing and developing. Exposure to air pollution can hinder lung growth, inhibit brain development, and increase the risk of respiratory infections, asthma, and pneumonia. UNICEF reports that 17 million babies worldwide are breathing toxic air, and almost one million children under the age of five die from pneumonia every year, making it the leading cause of death for children globally. A study by Queen Mary University of London found that children are exposed to higher levels of pollution, especially when walking to school and on playgrounds, and that the effects of this pollution are more severe than in adults.
The Elderly
Older adults are also considered fragile to the harmful impacts of air pollution. They are more susceptible to the health risks associated with pollution, particularly during physical activities. Studies have shown that air pollution can negatively affect the health of older adults, increasing the risk of hospitalization, especially for those with respiratory, cardiovascular, and mental disorders.
Pregnant Women
Pregnant women are another vulnerable group. Exposure to air pollution, especially during the early and late stages of pregnancy, can lead to adverse pregnancy outcomes, including pregnancy loss, preterm labor, and neonatal death. Maternal smoking and exposure to secondhand smoke can impact infant lung development and increase the risk of respiratory infections, asthma, and wheezing in children. Noise pollution has also been linked to higher levels of stress hormones in babies and an increased prevalence of congenital malformations.
Low-Income Communities
Low-income communities, including racial and ethnic minorities, often face higher exposure to pollutants and experience greater health risks. Studies have shown that communities with higher African American populations suffer a greater risk of premature death from particle pollution, and income is not the driving factor. Instead, other factors, such as chronic stress due to discrimination, may play a role. Additionally, unemployed individuals and those with low incomes or low education levels are more likely to live in areas with higher particle pollution exposure.
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Frequently asked questions
Pollution of air, water, and soil is responsible for at least 9 million deaths each year. It can cause a wide range of health issues, including coughing, itchy eyes, irritation of the eyes, skin, nose, and throat, headaches, nausea, dizziness, asthma, bronchitis, lung and heart problems, and cancer.
Air pollution is the single largest environmental health risk in Europe and is a major cause of premature death and disease. It can cause oxidative stress and inflammation in human cells, which may lead to chronic diseases and cancer. Fine particulate matter (PM 2.5) can be inhaled deeply into the lungs and contribute to serious health problems.
Air pollution has been classified as a human carcinogen by the International Agency for Research on Cancer of the World Health Organization (WHO). Studies have shown that living near highways and breathing in vehicle pollution increases the risk of developing breast cancer. Lung cancer rates are also higher in industrialized areas, with the mining and burning of coal increasing rates in communities where coal is used for energy generation.
Yes, children, the elderly, and people with pre-existing health conditions are more vulnerable to the effects of air pollution. Children breathe more than adults and have narrower air passages, so it takes less inflammation or irritation to obstruct their airways. Older adults may have heart or lung disease or diabetes, which puts them at greater risk.
Water pollution can have severe health impacts on humans, especially infants. High levels of nitrate in water can cause a condition called "blue baby syndrome" in infants, which removes oxygen from their blood and can be fatal if not treated promptly. Human-made chemical compounds, such as polyfluoroalkyl substances (PFAS), found in common household items, can contaminate water sources and pose severe health risks.
