Meghan Hodges
Air pollution is known to have a detrimental effect on asthma. It can increase the risk of developing asthma and worsen symptoms for those already suffering from the condition. Outdoor air pollution, such as ozone, haze, smoke, and dust, can trigger asthma attacks, while indoor air pollution, like mould, scented candles, and cleaning chemicals, can also irritate airways and cause issues. People with asthma are encouraged to monitor air pollution levels and limit their time outdoors when levels are high. Research has also shown that children are especially vulnerable to the effects of air pollution on asthma, with long-term exposure increasing their risk of developing the condition.
| Characteristics | Values |
|---|---|
| Effect of air pollution on asthma | Air pollution can increase the risk of developing asthma and worsen symptoms for those already affected. |
| Air pollutants | Ozone, particle pollution, sulfur dioxide, nitrogen dioxide, carbon monoxide, and particulate matter (PM2.5) |
| Impact on DNA | Air pollution may impact DNA associated with asthma, suppressing genes that regulate the immune system's ability to differentiate allergens from dangerous foreign substances. |
| Genetic variations | Genetic variations, such as specific polymorphisms in antioxidant enzyme genes, can modify the risk of asthmatic responses to air pollutants. |
| Indoor air pollution | Indoor air pollution from sources like cigarette smoke, scented candles, or cleaning chemicals can also trigger asthma attacks, especially for children who spend more time indoors. |
| Outdoor air pollution | Outdoor air pollution, particularly in cities with higher traffic and population density, can increase the risk of asthma attacks. |
| Climate change | Climate-driven warming is projected to increase childhood asthma incidence, with rising temperatures and drought contributing to more frequent and intense wildfires, which produce smoke and particle pollution. |
| Preventative measures | Improving indoor air quality through ventilation, air filtration, and limiting exposure to irritants; reducing outdoor activities and exercise during high pollution levels; utilizing public transportation or carpooling; and increasing vegetation in neighborhoods. |
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What You'll Learn
Indoor air pollution
Asthma is a chronic inflammatory airway disease with symptoms such as wheezing, dyspnoea, coughing, and chest tightness. It is estimated that between 1% and 18% of the population in different countries has asthma.
To reduce exposure to indoor air pollution, it is recommended to prevent mould growth by lowering humidity, using exhaust fans, and increasing airflow by opening windows and doors. It is also important to avoid scented products, store harmful products away from the home, and install carbon monoxide and radon alarms. Certified asthma and allergy-friendly air cleaners or filters can also help improve indoor air quality.
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Outdoor air pollution
Traffic and power generation are the primary sources of urban air pollution. Small airborne particles, known as "'particulate matter'" or PM, are another concern. The smallest particles (PM2.5) are the most dangerous as they can penetrate deep into the lungs and even enter the bloodstream. These particles are found in haze, smoke, soot, and airborne dust, causing serious air quality issues.
Several studies have found associations between asthma prevalence and exposure to outdoor PM. For example, in a study of ten European cities, 14% of new asthma cases in children and 15% of all exacerbations of childhood asthma were attributed to exposure to road traffic pollutants. Urbanization, with its associated population growth and increased outdoor air pollution, is a significant contributor to the rise in asthma cases.
The effects of outdoor air pollution on asthma are not limited to children. A study of African American adolescents found that even low levels of outdoor ozone were linked to respiratory changes and other adverse outcomes in those with difficult-to-treat asthma. Additionally, women seem to be more susceptible to the effects of tobacco smoke, a common outdoor air pollutant, than men.
To protect their health, people with asthma should limit their time outdoors when air pollution levels are high, especially during certain times of the day. They should also avoid exercising or working hard outdoors during these periods.
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Asthma triggers
Asthma is a condition that affects around 28 million people in the United States alone. It is characterised by inflamed airways that are sensitive to various triggers. These triggers can vary from person to person, and avoiding them is the best way to manage the condition.
One of the most common asthma triggers is air pollution. Small airborne particles, found in haze, smoke, soot, and dust, can irritate the airways and lungs, worsening asthma symptoms. Ozone, a common air pollutant, is particularly harmful as it is extremely irritating to the lungs and airways. Studies have also shown that air pollution can increase the risk of developing asthma, with outdoor pollutants migrating indoors, and indoor pollutants exacerbating the condition.
Another significant trigger is allergies. Asthma is often a type of allergic reaction, and people with asthma frequently have other allergies, such as food or pollen allergies. Allergens like pollen, pet dander, and dust mites can trigger asthma symptoms. Emotional factors, such as strong emotions, can also play a role in triggering asthma.
Respiratory infections, such as the common cold, flu, or sinus infection, are common triggers for asthma flare-ups. Exercise is another well-known trigger, especially in cold air, and can lead to exercise-induced bronchoconstriction (EIB). Thunderstorm asthma can affect people with asthma during high pollen and high humidity.
Other triggers include medicines such as aspirin, which may cause serious breathing problems in people with asthma, and extreme temperatures, with both hot and cold weather potentially triggering symptoms.
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Genetic susceptibility
Asthma is a complex disease influenced by both genetic and environmental factors. While the exact cause of asthma remains unknown, it is generally accepted that a combination of genetic predisposition and exposure to environmental triggers, such as air pollution, play a crucial role in its development and exacerbation.
An individual's genetic makeup can influence their susceptibility to asthma. Certain genetic variations have been associated with an increased risk of developing asthma when exposed to air pollutants. For example, specific polymorphisms in antioxidant enzyme genes, such as the glutathione-S-transferase family, particularly Glutathione S-Transferase Pi 1 (GSTP1), have been implicated in modifying the risk of asthmatic responses to pollutants.
Additionally, the N-Acetyltransferase 1 (NAT1) gene has been linked to asthma risk in children exposed to second-hand smoke (SHS), with maternal smoking during pregnancy identified as a significant risk factor for asthma development in offspring. The mechanisms behind this association are not yet fully understood, but epigenetics is believed to play a role.
Furthermore, some individuals with specific at-risk genetic variants may benefit from dietary supplementation to increase antioxidant levels, thereby reducing susceptibility to air pollution and asthma development.
Environmental Triggers
Air pollution, particularly indoor air pollution, has been identified as a significant environmental trigger for asthma. Indoor air pollutants, such as carbon monoxide, and outdoor fine particulate matter, including ozone, nitrogen oxides, and respirable particles, can irritate the airways and exacerbate asthma symptoms.
Children are especially vulnerable to the adverse effects of air pollution, with studies showing a positive association between air pollution and asthma prevalence in paediatric populations. African American adolescents have been found to be more susceptible to the respiratory effects of air pollution, even when using asthma therapies.
In summary, genetic susceptibility interacts with environmental triggers, such as air pollution, to influence the development and management of asthma. While genetic factors play a role in an individual's predisposition to asthma, exposure to air pollutants can act as a trigger, exacerbating symptoms and increasing the disease's severity. Therefore, reducing exposure to air pollution and implementing preventative measures are crucial to managing asthma effectively, especially in genetically susceptible individuals.
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Preventative treatments
Asthma is a common noncommunicable disease affecting 262 million people in 2019 and causing roughly half a million deaths annually. It is a condition that can be triggered or exacerbated by air pollution. Preventative treatments for asthma include:
Inhalers
Inhalers are a standard treatment for asthma, with two main types: relievers and controllers. Relievers are quick-acting medicines that prevent or ease symptoms during an asthma attack. Controllers are taken daily to prevent asthma attacks and control symptoms. Inhalers may contain inhaled corticosteroids, which reduce inflammation in the body, or short-acting beta2-agonists (SABAs), which open the airways to allow airflow.
Allergy Shots
Allergic asthma can be triggered by allergens such as pollen, dust mites, or mould. Allergy shots, also known as immunotherapy, can help treat allergic asthma by exposing patients to small amounts of the allergen to build tolerance over time.
Biologic Medicines
Biologic medicines are another option for treating allergic asthma. These target specific molecules or cells in the immune system that are involved in the allergic response. By blocking or altering the function of these targets, biologic medicines can help prevent or reduce the severity of allergic asthma attacks.
Environmental Modifications
Reducing exposure to air pollution and allergens can help prevent asthma attacks. This can include limiting time outdoors when air pollution levels are high, improving indoor air quality by using air filters or purifiers, and removing allergens from the home or workplace, such as dust, mould, or scented candles.
Bronchoscopy Procedure
In some cases, a healthcare provider may recommend a bronchoscopy procedure to prevent asthma attacks. This involves inserting a tube with a camera through the mouth to visualize the airways. Heat is then applied to the muscles along the airway walls to make them thinner and prevent narrowing. However, this procedure carries risks, including worsening asthma and airway infections.
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Frequently asked questions
Asthma does not have an effect on pollution. However, pollution can have a significant impact on asthma. Air pollution can worsen asthma symptoms and increase the risk of asthma attacks. People with asthma have airways that are sensitive to various substances, or triggers, in the air.
Common triggers of asthma due to pollution include ozone, carbon monoxide, nitrogen dioxide, and particulate matter (PM2.5).
People with asthma can protect themselves from pollution by limiting their time outdoors when air pollution levels are high, avoiding exercising near high-traffic areas, and using air conditioning and air purifiers indoors.
