Kiera Jefferson
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is the presence of one or more contaminants in the atmosphere, such as dust, fumes, gas, mist, odour, smoke or vapour, in quantities that can be harmful to human health. Almost all of the global population (99%) breathe air that exceeds WHO guideline limits and contains high levels of pollutants, with low- and middle-income countries suffering the highest exposures. Air pollution is the single largest environmental health risk in Europe and a major cause of premature death and disease. It can affect almost every organ in the body, impacting the lungs, heart, and brain, among other organs, and ultimately leading to disease.
| Characteristics | Values |
|---|---|
| Health problems | Coughing, itchy eyes, respiratory infections, heart disease, lung cancer, stroke, brain shrinkage, asthma, wheezing, coughing, bronchitis, emphysema, chronic obstructive pulmonary disease, type 2 diabetes, obesity, systemic inflammation, Alzheimer’s disease, dementia, osteoporosis, breast cancer, aggravated asthma, lower respiratory infections, reduced birth weight, pre-term birth, small for gestational age births, neurodevelopmental and metabolic diseases in children |
| Pollutants | Vehicle exhaust, smoke, road dust, industrial emissions, pollen, gas-fueled yard equipment, chemicals, vehicle emissions, fuel oils, natural gas, fumes from chemical production, ash and gases from volcanic eruptions, methane, ground-level ozone, various forms of carbon, nitrogen oxides, sulfur oxides, volatile organic compounds, polycyclic aromatic hydrocarbons, fine particulate matter, dust, fumes, gas, mist, odour, vapour, black carbon, ultrafine particles, particles from sand and dust storms |
| Populations at risk | Children, elderly, pregnant women, low-income communities, minority populations, populations with lung diseases |
| Global exposure | 99% of the global population breathes air that exceeds WHO guideline limits |
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What You'll Learn
- Air pollution impacts almost everyone, but certain groups are more vulnerable
- Pollutants can enter the bloodstream, causing inflammation and impacting organs
- Fine particulate matter, PM2.5, is linked to an increased risk of dementia
- Air pollution is a leading cause of cancer, especially lung cancer
- Household air pollution from open fires or stoves is dangerous for billions
Air pollution impacts almost everyone, but certain groups are more vulnerable
Air pollution is a mix of hazardous substances from both human-made and natural sources. Vehicle emissions, fuel oils, natural gas, manufacturing by-products, and power generation, especially coal-fired power plants, are the primary sources of human-made air pollution. Air pollution affects everyone's health, but certain groups are more vulnerable to its adverse effects.
The children, elderly, and pregnant women are more susceptible to air pollution-related diseases. Maternal exposure to air pollution is associated with adverse birth outcomes, such as low birth weight, pre-term birth, and small gestational age births. Air pollution may also affect diabetes and neurological development in children. A large study linked high levels of air pollutants to bone damage, particularly in the lumbar spine of postmenopausal women.
Low-income communities and minority populations are disproportionately exposed to air pollution and are more vulnerable. People with lower incomes experience fewer declines in industry, energy, transportation, residential, and commercial-related emissions over time. This results in higher exposure to air pollutants and increased health risks.
Additionally, certain agricultural practices contribute to poor air quality, impacting children's health, especially those with asthma. These practices expose children to pollutants, leading to respiratory issues and adverse long-term health effects.
The main pathway of exposure to air pollution is through the respiratory tract. Pollutants cause inflammation, oxidative stress, immunosuppression, and mutagenicity in cells, impacting the lungs, heart, and brain. Fine particulate matter (PM2.5) from wildfires and agriculture is associated with an increased risk of dementia.
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Pollutants can enter the bloodstream, causing inflammation and impacting organs
Air pollution is a mix of hazardous substances from human-made and natural sources. These include vehicle emissions, fuel oils, natural gas, manufacturing by-products, coal-fueled power plants, chemical production fumes, smoke from wildfires, ash and gases from volcanic eruptions, and methane from decomposing organic matter in soils.
These pollutants enter the body primarily through the respiratory tract, causing coughing, itchy eyes, and worsening breathing and lung diseases. Some pollutants are small enough to penetrate the lungs, enter the bloodstream, and circulate throughout the body, causing systemic inflammation and impacting almost every organ. This can lead to respiratory infections, heart disease, stroke, lung cancer, and other diseases.
For example, fine particulate matter (PM2.5) from agriculture and wildfires has been associated with an increased risk of dementia. High levels of air pollutants have also been linked to bone damage, particularly in postmenopausal women. Additionally, air pollution has been associated with adverse pregnancy outcomes, such as low birth weight and pre-term birth, as well as potential impacts on diabetes and neurological development in children.
The health effects of air pollution vary depending on age, location, underlying health, income, and other factors. Low-income communities and minority populations are often disproportionately exposed to air pollution and are more vulnerable to its adverse health impacts.
Furthermore, pollutants can enter the bloodstream through other pathways, such as skin absorption, ingestion, or injection, causing similar systemic effects and impacting organs throughout the body.
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Fine particulate matter, PM2.5, is linked to an increased risk of dementia
Air pollution is a mix of hazardous substances from both human-made and natural sources. It is a risk factor for various noncommunicable diseases (NCDs) and is emerging as a risk factor for dementia. Almost 9 out of 10 people who live in urban areas worldwide are affected by air pollution.
Fine particulate matter, PM2.5, is a common and critical pollutant of both ambient and household air pollution, leading to negative health impacts. It is a risk factor for various non-communicable diseases and is increasingly being associated with dementia. A systematic review of 28 longitudinal cohort studies reported a nonlinear relationship between ambient PM2.5 exposure and dementia, with a minimum of a 14% increased risk. This risk is further amplified in older individuals due to increased susceptibility linked to age-related declines in physiological resilience and greater pre-existing health risks.
The Health and Retirement Study, funded by the National Institute on Aging, also found that higher air pollution exposure was linked to an increased risk of dementia, with PM2.5 from agriculture and wildfires specifically associated with this increased risk.
A population-based cohort study in the United States investigated the association between long-term PM2.5 exposure and dementia incidence in the elderly population (age ≥65 years). Among approximately 2 million participants, 15.1% developed dementia, providing further evidence of the link between PM2.5 exposure and dementia.
While the evidence base for PM2.5 as a risk factor for dementia is growing, varied methodologies and measurements across studies have led to some inconsistencies in findings. Further research is needed to strengthen the understanding of the relationship between PM2.5 and dementia.
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Air pollution is a leading cause of cancer, especially lung cancer
Air pollution is a complex mix of hazardous substances from both human-made and natural sources. It includes vehicle emissions, fuel oils, natural gas, manufacturing by-products, and power generation sources, particularly coal-fueled power plants. Air pollution also encompasses fumes from chemical production, smoke from wildfires, ash and gases from volcanic eruptions, and gases emitted by decomposing organic matter in soils. These pollutants can enter our bodies through the respiratory tract, leading to inflammation, oxidative stress, immunosuppression, and mutagenicity in cells throughout our body.
Air pollution is a significant contributor to cancer, especially lung cancer. Fine particulate matter, or PM2.5, is a critical pollutant that poses a severe health risk. These tiny airborne particles, measuring 2.5 micrometres or less in diameter, can penetrate deep into the lungs and even enter the bloodstream. This particulate matter includes soil, dust, soot, and smoke, originating from sources such as coal- and natural gas-fired plants, cars, agriculture, wildfires, and construction sites. Exposure to these particles can trigger cellular changes in the airways, leading to lung cancer.
The World Health Organization (WHO) has estimated that air pollution contributes to approximately 8.1 million deaths annually, a figure comparable to the excess mortality caused by COVID-19 in 2020 and 2021. Lung cancer is the leading cause of cancer-related deaths in both men and women in the United States. While smoking is a well-known risk factor for lung cancer, air pollution is also a significant contributor. Overwhelming evidence indicates that outdoor particle pollution from sources like vehicle exhaust and industrial emissions can cause lung cancer.
The impact of air pollution on lung cancer is evident in both smokers and non-smokers. Studies have shown that approximately half of lung cancer cases in people who have never smoked are linked to air pollution. Additionally, air pollution can worsen lung cancer survival rates and increase the risk of early death. It is important to note that indoor air pollution, such as radon, can also contribute to lung cancer risk. However, outdoor air pollution, due to its pervasiveness, poses a more widespread threat to public health.
Addressing air pollution is crucial not only for preventing lung cancer but also for promoting overall health. Reducing air pollution leads to cleaner energy sources, increased green spaces, and healthier lifestyles, which collectively contribute to a reduced burden of cancer and other non-communicable diseases. By taking steps to mitigate air pollution, we can protect the health and well-being of individuals, especially those vulnerable to its harmful effects, including children, the elderly, and people with pre-existing health conditions.
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Household air pollution from open fires or stoves is dangerous for billions
Air pollution is a mix of hazardous substances from both human-made and natural sources. It contains contaminants that are dangerous to human health. Sources of human-made air pollution include vehicle emissions, fuel oils, natural gas, manufacturing by-products, and coal-fueled power plants.
Household air pollution is a significant contributor to overall air pollution. According to the World Health Organization, about 2.3 billion people lack access to clean cooking technologies and rely on burning solid fuels like wood, charcoal, coal, dung, and crop residues in rudimentary stoves or open fires. This practice releases dangerous particulate matter, carbon monoxide, and other toxic pollutants, leading to indoor air pollution levels that can be up to 20 times worse than the World Health Organization's air quality guidelines.
The use of polluting fuels and stoves for cooking has severe health consequences. The microscopic specs of dirt, dust, smoke, soot, and black carbon released during combustion are known as fine particulate matter. These particles, when inhaled, can enter the lungs and bloodstream, causing serious health issues. Short-term exposure to fine particulate matter can lead to respiratory infections, coughing, itchy eyes, and aggravated asthma. Long-term exposure increases the risk of non-communicable diseases, including stroke, heart disease, chronic obstructive pulmonary disease (COPD), lung cancer, and pneumonia.
The health risks associated with household air pollution disproportionately affect women and children. They are typically responsible for household chores such as cooking and collecting firewood, resulting in increased exposure to harmful smoke. In Africa, women and children account for 60% of early deaths related to smoke inhalation and household air pollution. Additionally, the time spent collecting fuel affects their ability to pursue education, economic opportunities, and leisure activities.
To address the dangers of household air pollution, it is essential to transition to cleaner fuels and technologies. Improved biomass stoves, as well as stoves powered by electricity, biogas, ethanol, and liquefied petroleum gas, can significantly reduce emissions and improve health outcomes. These alternatives not only reduce harmful emissions but also contribute to climate change mitigation and poverty alleviation.
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Frequently asked questions
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 are human-made sources of air pollution. When breathed in, these pollutants can enter the bloodstream and contribute to coughing or itchy eyes and cause or worsen many breathing and lung diseases, leading to hospitalizations, cancer, or even premature death.
Both short-term and long-term exposure to air pollution can lead to a wide range of diseases, including respiratory infections, stroke, heart disease, lung cancer, and acute and chronic respiratory diseases. Air pollution is also linked to neurodevelopmental and metabolic diseases in children, including Type 2 diabetes.
Yes, the children, elderly, and pregnant women are more susceptible to air pollution-related diseases. Additionally, low-income communities and minority populations are disproportionately exposed to air pollution and are more vulnerable to adverse health impacts.
The World Health Organization (WHO) has published air quality guidelines and the European Union (EU) has set standards for key air pollutants in the ambient air quality directives. It is important for local and state officials to consider air pollution when making decisions about transportation, industrial activity, and regional planning.
