Greta Jimenez
Air pollution is a major threat to global health, causing millions of deaths each year. It is caused by the presence of contaminants in the atmosphere, such as dust, fumes, gas, mist, odour, smoke or vapour, in quantities that can be harmful to human health. These pollutants can enter our bodies through the respiratory tract and bloodstream, leading to inflammation, oxidative stress, immunosuppression, and mutagenicity in cells, impacting various organs and causing diseases. Both short-term and long-term exposure to air pollution can have adverse health effects, and certain groups, such as low-income communities and minority populations, may be more vulnerable to its impacts. Fine particulate matter, such as PM2.5, is of particular concern as it can penetrate deep into the lungs and cause systemic damage. Maternal exposure to air pollution is also associated with adverse birth outcomes. As air pollution is a complex and widespread issue, addressing it requires collective efforts and policy interventions to reduce emissions and improve overall environmental quality.
| Characteristics | Values |
|---|---|
| Number of deaths caused by air pollution each year | 6.5 million (globally) |
| Number of deaths caused by air pollution each year (WHO estimate) | 7 million |
| Number of children under 5 who die prematurely from breathing polluted air each year | 442,000 |
| Percentage of deaths caused by environmental factors | 27% |
| Number of premature deaths attributable to PM2.5 in the 27 EU Member States in 2020 | 238,000 |
| Percentage of the urban population exposed to concentrations of fine particulate matter above the health-based guideline level set by the World Health Organization in 2021 | 97% |
| Percentage of people living in urban areas worldwide affected by air pollution | 90% |
| Percentage of people who breathe polluted air | 90% |
| Number of premature deaths caused by exposure to smoke from cooking fires each year | 3.2 million |
| Types of air pollution | Ambient air pollution (outdoor pollution), household air pollution (indoor air pollution) |
| Common indoor air pollutants | Radon, smoke, lead dust, carbon monoxide, mold, volatile organic compounds, fine particles, biological pollutants |
| Common outdoor sources of air pollution | Vehicle exhaust, smoke, road dust, industrial emissions, pollen, gas-fueled yard equipment, chemicals |
| Diseases associated with exposure to air pollution | Stroke, chronic obstructive pulmonary disease, trachea, bronchus and lung cancers, aggravated asthma, lower respiratory infections, type 2 diabetes, obesity, systemic inflammation, Alzheimer’s disease, dementia, heart disease, pneumonia, emphysema, chronic bronchitis, asthma, ischemic heart disease |
| Populations most at risk of health problems related to air pollution | People with lung diseases, low-income communities, minority populations, pregnant women, older people, children |
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What You'll Learn
- Air pollution is linked to respiratory issues, including asthma, coughing, and lung disease
- Pollutants can enter the bloodstream, causing systemic inflammation and impacting major organs
- Exposure to pollution during pregnancy is associated with adverse birth outcomes
- Pollutants can cause oxidative stress, immunosuppression, and mutagenicity, increasing disease risk
- Fine particulate matter, especially from candles or fireplaces, can cause serious health issues
Air pollution is linked to respiratory issues, including asthma, coughing, and lung disease
Air pollution is a major threat to global health, causing more than 6.5 million deaths each year worldwide. It is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, natural gas, manufacturing by-products, and fumes from coal-fueled power plants are all examples of human-made air pollution. Natural sources include volcanoes, pollen, sandstorms, and soil.
Air pollution is particularly harmful to those with respiratory issues, including asthma, coughing, and lung disease. Fine particulate matter (PM2.5) is the air pollutant driving the most significant health problems. In 2021, 97% of the urban population was exposed to concentrations of fine particulate matter above the health-based guideline level set by the World Health Organization (WHO). PM2.5 particles can reach the breathing sacs in the lungs and even cross into the bloodstream, carrying toxic chemicals that are linked to cancer.
Asthma is a respiratory condition that can be triggered and aggravated by air pollution. Exposure to particle pollution, such as diesel exhaust, can lead to asthma attacks and increased asthma symptoms. Children with asthma seem to be more affected by particle pollution than adults, possibly due to anatomical factors that lead to higher deposition in the tracheobronchial region of the lung. Higher levels of air pollution have been linked to increased short-term respiratory infections and school absences in children.
Air pollution can also cause coughing and irritate the airways, making it harder to breathe. Sulphur dioxide (SO2), produced by burning fuels like coal and oil, is a pollutant that can cause coughing, chest tightness, and breathing difficulties. Nitrogen dioxide, another pollutant, can irritate the lining of the airways and make them more inflamed, leading to asthma attacks and exacerbating lung conditions.
Long-term exposure to air pollution has been linked to the development of lung diseases such as chronic obstructive pulmonary disease (COPD), emphysema, chronic bronchitis, and lung cancer. Research has found connections between air pollution and respiratory infections, with one study linking exposure to wildfire smoke to more severe cases of COVID-19 and deaths. Overall, air pollution poses a significant risk to respiratory health, particularly for those with pre-existing conditions and vulnerable groups such as children, the elderly, and low-income communities.
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Pollutants can enter the bloodstream, causing systemic inflammation and impacting major organs
Air pollution is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, natural gas, and fumes from chemical production are some examples of human-made air pollution. On the other hand, nature releases hazardous substances such as smoke from wildfires, ash and gases from volcanic eruptions, and methane from decomposing organic matter.
Air pollution is a major threat to global health and prosperity, causing more than 6.5 million deaths each year worldwide. It is composed of various pollutants, including particulate matter (PM), carbon monoxide (CO), ozone (O3), nitrogen dioxide (NO2), and sulphur dioxide (SO2). Of these, fine particulate matter (PM2.5) is of particular concern as it can be inhaled deeply into the lungs and contribute to serious health problems. PM2.5 is about 30 times thinner than a human hair and can penetrate the lung barrier, entering the bloodstream and travelling to various organs in the body. This can lead to systemic inflammation and damage to tissues and cells.
The health effects of air pollution exposure can vary depending on several factors. These include the specific pollutants involved, the levels and duration of exposure, and individual factors such as age, genetics, and pre-existing health conditions. Short-term exposure to high levels of air pollution has been linked to reduced lung function, asthma, cardiac problems, and increased hospital admissions. Long-term exposure can impact almost every organ in the body, increasing the risk of chronic diseases, cancer, stroke, ischaemic heart disease, chronic obstructive pulmonary disease, lung cancer, pneumonia, and adverse pregnancy outcomes.
Children, the elderly, and pregnant women are more susceptible to the health effects of air pollution. In children, exposure to air pollution can impact neurological development and increase the risk of short-term respiratory infections, leading to more school absences. For pregnant women, air pollution exposure has been associated with adverse birth outcomes, including low birth weight, pre-term birth, and small for gestational age births. Additionally, certain racial or ethnic and socioeconomic disparities exist, with people of lower incomes experiencing fewer declines in emissions.
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Exposure to pollution during pregnancy is associated with adverse birth outcomes
Air pollution is a major threat to global health, causing more than 6.5 million deaths annually. It is a mix of hazardous substances from human-made and natural sources, including vehicle emissions, fuel oils, natural gas, manufacturing by-products, and power generation. While air pollution affects everyone, certain groups are more vulnerable, including children, the elderly, and those with pre-existing health conditions.
Pregnant women are among those who are particularly susceptible to the adverse effects of air pollution. Exposure to air pollution during pregnancy has been linked to various negative outcomes for both the mother and the developing fetus. One of the critical areas of concern is the impact on organ development and organogenesis. Studies have found a correlation between prenatal exposure to air pollution and infant and child lung function impairment, increased respiratory symptoms, and the development of childhood asthma.
The respiratory health of pregnant women is also at risk. Air pollution can exacerbate asthma, which, if untreated, can lead to preeclampsia and other complications. Additionally, exposure to high levels of particulate matter during the third trimester has been associated with an increased risk of autism in the child, as indicated by a Harvard study.
Furthermore, air pollution has been linked to adverse birth outcomes, including low birth weight, neonatal jaundice, and preterm birth. A study in Beijing, a city with high air pollution levels, found that lowering emissions and improving air quality resulted in heavier birth weights. Similarly, the Stockholm Environment Institute at the University of York estimated that approximately three million babies are born prematurely each year due to air pollution.
The impact of air pollution during pregnancy extends beyond birth outcomes. The metal buildup in the placenta due to pollution can restrict fetal growth, increase gestational diabetes, and reduce chromosomal stability. Additionally, exposure to pollutants during pregnancy may have lasting effects on the child's future health and susceptibility to diseases later in life, as suggested by the Developmental Origins of Health and Disease hypothesis.
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Pollutants can cause oxidative stress, immunosuppression, and mutagenicity, increasing disease risk
Air pollution is the presence of contaminants in the atmosphere, such as dust, fumes, gases, smoke, and other pollutants. These pollutants can have detrimental effects on human health, including oxidative stress, immunosuppression, and mutagenicity, which increase the risk of various diseases.
Oxidative stress is caused by an imbalance between the formation of reactive oxygen species (ROS) and the body's antioxidant defence mechanisms. Sources of ROS include vehicle emissions, diesel exhaust particles, environmental tobacco smoke, and chemical reactions. Long-term exposure to high levels of these particles can increase the risk of cancer, respiratory diseases, and arteriosclerosis. Oxidative stress can also lead to inflammation, which is a protective mechanism that removes injurious stimuli but can also cause tissue injury and impact the lungs, heart, and brain.
Particulate matter (PM), especially fine particles (PM2.5) and ultrafine particles (PM0.1), are potent oxidants that can generate ROS and trigger biological processes such as inflammation and cell death. The intensity and quality of PM exposure are important determinants of its health impact, and numerous studies have shown increased morbidity and mortality due to environmental air pollution.
Air pollution can also cause immunosuppression, impacting the body's ability to defend itself against diseases. Fine particulate matter can penetrate deep into the lungs, enter the bloodstream, and travel to other organs, causing systemic damage to tissues and cells. This can lead to a wide range of health problems, including respiratory diseases, systemic inflammation, and an increased risk of cancer.
Furthermore, pollutants can act as mutagens, permanently altering genetic material, usually DNA. This can increase the frequency of mutations and lead to chromosomal instability, rearrangement, and modifications to the DNA sequence. While not all mutations cause harmful effects, some can result in serious diseases, including cancer. Mutagens can be found in various pollutants, such as polyaromatic hydrocarbons present in soot and coal tar.
The health effects of air pollution are wide-ranging and can impact almost every organ in the body. Children, the elderly, and pregnant women are particularly susceptible to air pollution-related diseases, and long-term exposure can increase the risk of various health conditions, including stroke, chronic obstructive pulmonary disease, and respiratory infections.
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Fine particulate matter, especially from candles or fireplaces, can cause serious health issues
Air pollution is a major environmental health hazard, causing over 6.5 million deaths each year globally. Fine particulate matter, or PM2.5, is a significant contributor to this toll. These particles are tiny—about 30 times smaller than a human hair—and can travel deeply into the respiratory tract, reaching the lungs. Here, they can cause irritation to the eyes, nose, throat, and lungs, as well as coughing, sneezing, a runny nose, and shortness of breath.
Fine particulate matter from candles or fireplaces can contribute to indoor air pollution, which the World Health Organization (WHO) has linked to a range of adverse health effects. Incomplete combustion processes, such as those that occur when burning candles or wood in a fireplace, produce harmful by-products like NO2. These by-products can reach particularly high concentrations in indoor environments when operating open flames without venting.
The health impacts of indoor fine particulate matter from candles or fireplaces can be serious. Short-term exposure can affect heart and lung function, exacerbating conditions like heart disease, asthma, and chronic bronchitis. It can also increase the risk of heart attacks. Long-term exposure is associated with increased mortality from heart disease, reduced lung function, and lung cancer. Vulnerable groups, including people with heart and lung conditions, pregnant women, children, and older adults, may be particularly susceptible to the adverse effects of indoor fine particulate matter.
Additionally, indoor air pollution from candles or fireplaces can have broader health implications. Studies have linked indoor fine particulate matter to increased risks of cardiovascular and respiratory events, including hospitalizations and emergency department visits. Furthermore, indoor air pollution can interact with other pollutants and stressors in a community, potentially compounding its health impacts.
While the specific chemical composition of candle emissions and their health effects require further research, current knowledge emphasizes the importance of ventilation and adhering to air quality guidelines to minimize the health risks associated with fine particulate matter from candles or fireplaces.
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Frequently asked questions
Air pollution is 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.
Air pollution is a major threat to global health and prosperity. It is the single largest environmental health risk in Europe and a major cause of premature death and disease. It affects everyone, but certain groups may be harmed more. It can cause coughing, itchy eyes, and worsen breathing and lung diseases. It can also lead to cancer, stroke, heart disease, and lung cancer.
The two main types of air pollution are ambient air pollution (outdoor pollution) and household air pollution (indoor air pollution). Ambient air pollution is caused by the combustion of fossil fuels and affects people in low-, middle-, and high-income countries. Household air pollution is caused by the use of solid fuels and kerosene in open fires and inefficient stoves, mainly in low- and middle-income countries.
There are many sources of air pollution, including vehicle emissions, fuel oils, natural gas, manufacturing by-products, and power generation. Indoor air pollution can be caused by radon, smoke, lead dust, carbon monoxide, mould, and volatile organic compounds.
Maternal exposure to air pollution is associated with adverse birth outcomes, such as low birth weight, pre-term birth, and small for gestational age births. Air pollution can also affect neurological development in children and increase the risk of respiratory infections, which are the second leading cause of death for children under five years.
