
Candles are a popular way to create a pleasant ambiance, but they can also be a source of indoor air pollution. The type of wax, wick, and fragrance used in candles can emit harmful chemicals, even when the candle is not lit. For example, paraffin wax, which is a petroleum byproduct, releases toxic volatile organic compounds (VOCs) and known carcinogens such as benzene, toluene, and formaldehyde when burned. These toxins are the same as those produced by burning diesel fuel and can contaminate indoor spaces, aggravate asthma, cause allergy-like symptoms, and irritate the respiratory tract. To reduce negative health impacts, it is recommended to use vegetable- or soy-based candles, which burn cleaner and produce fewer soot particles. While candles can contribute to poor air quality, there are also claims that beeswax candles can help clean the air by releasing negative ions that bind to and remove toxins.
| Characteristics | Values |
|---|---|
| Air quality | Burning candles can contribute to indoor air pollution and poor indoor air quality. |
| Toxins | Candles can release carcinogenic toxins such as benzene, toluene, formaldehyde, acetaldehyde, and acrolein into the air. |
| Health risks | Inhalation of candle smoke can lead to respiratory issues, asthma attacks, skin problems, headaches, dizziness, and coughing and wheezing. It can also trigger allergic reactions and aggravate pre-existing conditions such as asthma or chronic bronchitis. |
| Alternatives | Beeswax, soy, or vegetable-based candles are healthier alternatives to paraffin wax candles as they burn cleaner and produce less soot. |
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What You'll Learn

Paraffin wax candles emit harmful pollutants and toxins
Paraffin wax candles are a leading cause of indoor air pollution, according to the EPA. When burned, paraffin wax releases harmful chemicals and toxins into the air. These toxins include acetone, benzene, toluene, formaldehyde, acetaldehyde, acrolein, and soot. These are the same toxins produced by burning diesel fuel.
The toxins released from paraffin wax candles are linked to various health issues. Frequent exposure to these pollutants can contribute to long-term health problems, especially for those who burn candles regularly. Lighting many candles in an unventilated space can aggravate asthma, cause allergy-like symptoms, irritate the respiratory tract, and cause headaches, dizziness, and trouble breathing.
The American Lung Association states that for people with asthma, the scents from scented candles alone can cause problems with breathing. Scented candles emit Volatile Organic Compounds (VOCs), which are irritants and can cause cancer. They can also react with other gases to form additional air pollutants.
To avoid the toxins and pollutants emitted by paraffin wax candles, it is recommended to use candles made from beeswax, soy wax, coconut wax, or other plant-based waxes. These candles burn cleaner than regular paraffin wax and can help improve indoor air quality. Beeswax candles, in particular, release negative ions that bind with toxins and help remove them from the air.
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Scented candles can release harmful chemicals, even when unlit
Scented candles are popular for creating a pleasant ambiance and aroma in homes. However, they can also negatively impact indoor air quality and release harmful chemicals, even when unlit.
The average scented candle is made from paraffin wax, a petroleum byproduct, and scented with synthetic fragrances and dyes. When burned, these candles emit toxic chemicals and pollutants such as benzene, formaldehyde, acetone, toluene, and soot. These emissions are similar to diesel fuel emissions and can cause allergies, asthma attacks, and skin problems. Even when not lit, paraffin wax candles can release low levels of benzene.
The wicks of scented candles can also be a source of concern. Lead was once commonly used in candle wicks, posing a lead poisoning hazard, especially to young children. Additionally, scented candles with cored wicks made from cotton can soften and cause the wick to fall over into the wax.
To reduce exposure to harmful chemicals, it is recommended to choose candles made from natural materials such as beeswax or soy wax and scented with essential oils rather than synthetic perfumes. Beeswax candles, in particular, can help improve air quality by releasing negative ions that bind with toxins and remove them from the air. Vegetable-based candles are also a healthier option, as they do not produce toxic chemicals.
While scented candles can enhance the atmosphere and scent of a home, it is important to be aware of the potential risks associated with their use. Burning candles, especially those made from paraffin wax, can contribute to poor indoor air quality and expose individuals to harmful chemicals, even when unlit.
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Burning candles can cause respiratory issues and allergies
Burning candles, especially paraffin or scented candles, can release harmful toxins and pollutants that can cause respiratory issues and allergies. When burned, paraffin wax candles emit carcinogenic toxins such as benzene, toluene, formaldehyde, acetaldehyde, and acrolein, as well as soot. These toxins are similar to those produced by burning diesel fuel. The emissions from paraffin candles can contaminate ventilation systems and discolour walls and ceilings.
Lighting multiple candles in an unventilated space can aggravate asthma, trigger allergy-like symptoms, and irritate the respiratory tract. The American Lung Association warns that scented candles can cause breathing problems for asthmatics, and the candles emit volatile organic compounds (VOCs) that are irritants and can cause cancer. These VOCs can also react with other gases to form additional air pollutants. Symptoms such as headaches, dizziness, and trouble breathing have been linked to the inhalation of these compounds.
To minimise the negative impacts on respiratory health, it is recommended to limit the burning time of candles, especially paraffin or scented candles. Alternatively, soy, vegetable, or beeswax candles are healthier options as they burn cleaner and produce fewer soot particles. Beeswax candles, in particular, release negative ions that bind with toxins and help remove them from the air. Electric candles are also recommended as they provide ambiance without the same level of health hazards.
While candles can enhance ambiance and provide pleasant aromas, it is important to be mindful of their potential impact on respiratory health, especially for individuals with asthma or allergies. By choosing alternative types of candles, limiting burning times, and ensuring proper ventilation, the risks associated with candle burning can be mitigated.
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Soy and beeswax candles are healthier alternatives
Burning candles can release carcinogenic toxins such as benzene, toluene, formaldehyde, acetaldehyde, and acrolein, as well as soot, into the air. Paraffin (petroleum-based) candles and scented/aromatic candles are the most common offenders.
Soy candles are a safe alternative to paraffin, with low soot production and minimal emissions. They are non-toxic and can be customised with natural scents. Soy wax is also biodegradable, renewable, and derived from soybean oil. It is important to ensure that pure soy candles are purchased to avoid blends with non-vegan additives. Soy candles are ideal for scented candles, providing a stronger and more consistent fragrance that lasts throughout the candle's burn time. However, soy wax goes through several chemical treatments before it is ready for sale, and commercial soybean farming practices involve the use of herbicides, pesticides, and fertilisers, which can leave traces of these chemicals in the final product.
Beeswax candles are a renewable, chemical-free, and eco-friendly alternative to paraffin wax. They are harvested through sustainable beekeeping practices and support natural ecosystems. Beeswax candles burn cleanly, producing minimal soot, and naturally emit a subtle honey scent without synthetic additives. They are hypoallergenic, making them ideal for those with sensitivities. However, beeswax is not vegan, and large-scale production may stress bee populations, making ethical sourcing crucial.
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Metal-cored wicks can release trace amounts of heavy metals
Burning candles can release harmful toxins into the air, including benzene, toluene, formaldehyde, acetaldehyde, and acrolein. The type of wax and wick used in a candle can impact the amount and toxicity of the emissions. Paraffin wax, for example, is a petroleum byproduct that releases carcinogenic toxins when burned. These toxins are similar to those produced by burning diesel fuel and can contaminate indoor air and surfaces.
While beeswax and soy candles are often recommended as cleaner-burning alternatives, they still produce emissions, including soot and VOCs (volatile organic compounds). Additionally, the fragrance oils in scented candles can emit harmful chemicals, even when unlit. These chemicals can include formaldehyde, alcohol, esters, and petroleum distillates, which can cause headaches, dizziness, and respiratory issues.
Metal-cored wicks, commonly found in scented candles, have been a particular cause for concern. These wicks are designed with a metal support, usually zinc or tin, wrapped in cotton to prevent the wick from falling over into the wax. While lead was once commonly used in cored wicks, it was banned in 2003 by the U.S. Consumer Product Safety Commission due to the risk of lead poisoning, particularly in children.
Today's metal-cored wicks can still release trace amounts of heavy metals into the air during combustion. While the amount of heavy metal released may be small, it is important to consider the potential impact on indoor air quality and personal health, especially with frequent or prolonged exposure. The cumulative effect of these trace emissions could be a cause for concern, especially for individuals with respiratory sensitivities or compromised immune systems.
To minimize the potential risks associated with candle burning, it is recommended to opt for candles with alternative wicks, such as those made from pure cotton or wood. Additionally, ensuring adequate ventilation and limiting the burning time of candles can help reduce the concentration of harmful substances in the air. For those seeking a completely smoke-free option, electric candles provide the ambiance of a traditional candle without the associated health hazards.
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Frequently asked questions
Yes, burning candles can release carcinogenic toxins such as benzene, toluene, formaldehyde, acetaldehyde, and acrolein into the air. The emissions from paraffin and scented candles are especially harmful as they contain many of the same toxins produced by burning diesel fuel. These toxins can cause health issues such as asthma, allergy-like symptoms, and irritation of the respiratory tract.
Paraffin or petroleum-based candles are the worst offenders when it comes to releasing toxins. Scented candles are also problematic as they use synthetic fragrances and dyes that give off dangerous volatile organic compounds (VOCs) even at room temperature.
Yes, beeswax or soy candles are better alternatives as they burn cleaner than paraffin wax. Beeswax candles can also help clean the air by releasing negative ions that bind with toxins and help remove them from the air. Vegetable-based candles are another healthy option as they do not produce toxic chemicals.











































