Helena Joyce
Air pollution is a mix of hazardous substances from both human-made and natural sources, and it is the single largest environmental health risk in Europe. It is a major cause of premature death and disease, contributing to millions of deaths each year. Air pollution is linked to a wide range of diseases, including stroke, chronic obstructive pulmonary disease, lung cancer, and aggravated asthma. It can also cause systemic inflammation, impact brain development, and increase the risk of respiratory infections, heart disease, and dementia. Almost everyone is affected by air pollution, but certain groups are more vulnerable, including children, the elderly, pregnant women, and people with pre-existing health conditions.
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What You'll Learn
Air pollution and respiratory health
Air pollution is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, and natural gas used to heat homes, by-products of manufacturing and power generation, and fumes from chemical production are the primary sources of human-made air pollution. Natural sources include smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane emitted from decomposing organic matter in soils.
Air pollution affects everyone, but certain groups are more vulnerable. Research indicates that there are racial or ethnic and socioeconomic disparities in air pollution emissions. People with lower incomes generally experience fewer declines in industry, energy, transportation, residential, and commercial-related emissions than those with higher incomes. The elderly, children, and pregnant women are more susceptible to air pollution-related diseases. Genetics, comorbidities, nutrition, and sociodemographic factors also impact a person's susceptibility to air pollution.
The main pathway of exposure to air pollution is through the respiratory tract. Breathing in pollutants can cause inflammation, oxidative stress, immunosuppression, and mutagenicity in cells throughout the body, impacting the lungs, heart, and brain, among other organs, and ultimately leading to disease. Fine particulate matter, or PM2.5, from agriculture and wildfires has been specifically associated with an increased risk of dementia.
Short-term exposure to air pollutants can lead to reduced lung function, respiratory infections, and aggravated asthma. Long-term exposure increases the risk of diseases with a longer onset, such as non-communicable diseases including stroke, heart disease, chronic obstructive pulmonary disease, and lung cancer. Air pollution can trigger asthma attacks, cause wheezing and coughing, and worsen existing lung diseases. Constant exposure to elevated particle pollution will contribute to reduced respiratory function.
To reduce the health impacts of air pollution, individuals can minimize their exposure, but the greatest opportunity for progress is through local, state, and national policy changes. Transitioning to clean energy sources, such as wind and solar power, and adopting zero-emission transportation systems can significantly improve air quality and reduce the harmful respiratory effects of air pollution.
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The impact of pollution on children
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is a serious issue that affects everyone, with almost 9 out of 10 people worldwide impacted by it, especially those in urban areas. While air pollution is detrimental to all, certain groups may be harmed more than others.
Children are particularly vulnerable to the effects of air pollution. According to the World Health Organization (WHO), around 93% of the world's children under the age of 15 years (approximately 1.8 billion children) breathe polluted air that puts their health and development at serious risk. This has devastating consequences, with an estimated 600,000 children dying from acute lower respiratory infections caused by polluted air in 2016. Furthermore, air pollution is linked to premature births and low birth weight in newborns, with evidence suggesting that exposure to polluted air during pregnancy can harm children before they are born.
The impact of air pollution on children's health is extensive. Firstly, it affects their respiratory health, increasing short-term respiratory infections and exacerbating conditions such as asthma. Secondly, air pollution impacts children's neurodevelopment and cognitive abilities, with studies showing lower cognitive test outcomes and negative effects on mental and motor development. Additionally, there is emerging evidence linking air pollution exposure to cancer, neurodevelopmental and metabolic diseases in children. Children exposed to high levels of air pollution may also be at greater risk for chronic diseases such as cardiovascular disease later in life.
The sources of air pollution that impact children include vehicle emissions, fuel oils, natural gas used for heating, manufacturing by-products, power generation, and chemical production. Household air pollution is also a significant concern, especially in homes using polluting fuels and technologies for cooking, heating, and lighting. These sources contribute to the fine particulate matter that can penetrate deep into children's lungs, causing irritation, inflammation, and damage to the respiratory tract.
Addressing air pollution is crucial to protect children's health and well-being. Reducing emissions of dangerous pollutants, transitioning to clean cooking and heating fuels, promoting cleaner transportation, and implementing energy-efficient practices are some of the measures that can be taken to improve air quality and mitigate the impact of pollution on children.
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Pollutants and their sources
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is the single largest environmental health risk in Europe and is a major cause of premature death and disease worldwide. In 2021, the World Health Organization (WHO) published new air quality guidelines following a systematic review of the latest scientific evidence demonstrating how air pollution damages human health.
Particulate Matter (PM): Particles of variable but very small diameter, penetrate the respiratory system via inhalation, causing respiratory and cardiovascular diseases, reproductive and central nervous system dysfunctions, and cancer. PM2.5, or particles with a diameter of 2.5 microns or less, can penetrate the lung barrier and enter the bloodstream, affecting all major organs of the body. These pollutants increase the risk of heart and respiratory diseases, as well as lung cancer and strokes. PM10, or particles with a diameter of 10 microns or less, can penetrate and lodge deep inside the lungs, causing irritation, inflammation, and damaging the lining of the respiratory tract.
Ozone (O3): Ground-level ozone is caused by a chemical reaction of gases, such as NO2, in the presence of sunlight. It is a major factor in causing asthma and worsening respiratory conditions. While ozone in the stratosphere plays a protective role against ultraviolet irradiation, it is harmful when present in high concentrations at ground level.
Nitrogen Oxides (NOx): Nitrogen dioxide (NO2) and nitrogen oxide are harmful to humans and are major components of traffic-related air pollution. They can cause asthma, bronchial symptoms, lung inflammation, and damage to the respiratory tract.
Sulfur Oxides (SOx): Sulfur dioxide (SO2) is a harmful air pollutant that can cause asthma, bronchial symptoms, and lung inflammation. It is a major component of emissions from coal-fired power plants and industrial processes.
Volatile Organic Compounds (VOCs): VOCs are emitted from various human activities, such as chemical production, and are considered air pollutants that are harmful to humans.
Polycyclic Aromatic Hydrocarbons (PAHs): PAHs are released from the combustion of fossil fuels, such as coal, oil, and gas, and are known to have adverse health effects, including cancer.
Lead: Metals, ore, and piston-engine aircraft are major sources of lead pollution in the air. Lead poisoning can have deleterious effects on humans, animals, and the environment, especially in developing countries. Exposure to lead can occur through inhalation, ingestion, and dermal absorption, and it poses a particular threat to the developing nervous systems of fetuses and children.
Radioactive Materials: Radioactive substances such as radium and uranium can contaminate surface water bodies and accumulate in the bones of humans, plants, and animals, leading to cancers.
Agricultural Pollutants: Certain agricultural practices, such as the use of specific chemicals and fuels, can contribute to poor air quality and respiratory issues, particularly in children.
It is important to note that the sources and impacts of these pollutants are interconnected and can vary based on geographic location, socioeconomic factors, and individual vulnerabilities.
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How pollution affects the body
Air pollution is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, and natural gas used to heat homes, by-products of manufacturing and power generation, and fumes from chemical production are the primary sources of human-made air pollution. Nature also releases hazardous substances into the air, such as smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane, which are emitted from decomposing organic matter in soils.
Air pollution affects everyone, but certain groups are more vulnerable than others. People with lung diseases, such as asthma, chronic bronchitis, and emphysema, are at a higher risk of experiencing health problems due to air pollution. Children are particularly susceptible to the harmful effects of air pollution as their bodies and immune systems are still developing. Exposure to air pollution during childhood increases the risk of diseases later in life.
Particulate matter (PM) refers to particles of variable but very small diameter that penetrate the respiratory system via inhalation. Particles with a diameter of 10 microns or less (PM10) can lodge deep inside the lungs, causing irritation, inflammation, and damaging the lining of the respiratory tract. Smaller particles with a diameter of 2.5 microns or less (PM2.5) can penetrate the lung barrier and enter the bloodstream, affecting all major organs. These fine particles are the air pollutants driving the most significant health problems, including respiratory and cardiovascular diseases, reproductive and central nervous system dysfunctions, and cancer.
In addition to respiratory issues, air pollution has been linked to a higher risk of stroke, heart disease, lung cancer, and acute and chronic respiratory diseases. There is also emerging evidence of a link between air pollution and neurodevelopmental and metabolic diseases in children. Furthermore, air pollution has been associated with an increased risk of dementia, with higher exposure linked to brain shrinkage in older women.
Noise pollution, produced by machines, vehicles, and traffic noises, is another form of pollution that can harm human health, particularly hearing. Lead pollution is another significant concern, with exposure occurring through inhalation, ingestion, and dermal absorption. Lead toxicity can affect the fetal nervous system and has been linked to learning disabilities in children.
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Pollution and socioeconomic status
Air pollution is a mix of hazardous substances from both human-made and natural sources. It can affect everyone, but certain groups are more vulnerable to its adverse effects. These groups include children, the elderly, pregnant women, and people with pre-existing health conditions. Additionally, socioeconomic status plays a significant role in the impact of pollution on human health.
Socioeconomic disparities exist in the exposure to and health consequences of air pollution. Research indicates racial or ethnic and socioeconomic disparities in air pollution emissions. People with higher incomes tend to experience greater reductions in industry, energy, transportation, residential, and commercial-related emissions compared to those with lower incomes. This disparity is also evident across different racial and ethnic groups, with non-white populations, especially Blacks, facing a higher risk of adverse health effects from particle pollution.
Several factors contribute to these socioeconomic disparities. Firstly, pollution sources are often located near disadvantaged communities, increasing their exposure to harmful pollutants. Secondly, individuals of lower socioeconomic status may have limited access to healthcare, nutritious food, and healthy lifestyle opportunities, making them more susceptible to the health impacts of pollution. Additionally, psychosocial stressors, such as discrimination and chronic stress, are more prevalent in these communities, further exacerbating the health risks associated with air pollution.
The impact of air pollution on mortality rates also varies with socioeconomic status. An inverse relationship has been observed between socioeconomic status and mortality due to air pollution in Western countries. This association is particularly notable for all-cause mortality and specific causes such as cardiovascular diseases and cancers. The prevalence of risk factors for fatal diseases also tends to be higher among individuals of lower socioeconomic status.
Furthermore, socioeconomic status can influence the long-term health outcomes associated with air pollution exposure. For example, a study in New Jersey found that long-term exposure to particle pollution increased the risk of premature death, particularly in communities with larger African American populations, lower home values, and lower median incomes. Similarly, in Atlanta, particle pollution was linked to a higher risk of asthma attacks in zip codes with high poverty rates and among individuals eligible for Medicaid.
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Frequently asked questions
Long-term exposure to air pollution can increase a person's risk of developing noncommunicable diseases, including stroke, heart disease, chronic obstructive pulmonary disease, lung cancer, type 2 diabetes, obesity, Alzheimer's disease, and dementia.
Maternal exposure to air pollution is associated with adverse birth outcomes, such as low birth weight, premature birth, and small for gestational age births. In 2019, 476,000 infants died in their first month of life from health effects associated with air pollution exposure.
When inhaled, pollutants can enter the bloodstream through the lungs and circulate throughout the body, causing systemic inflammation and impacting almost every organ, including the lungs, heart, and brain.
