
Incense and candles are popular ways to fill your home with fragrance, but they have also been found to have negative impacts on health and the environment. The burning of incense and candles can release harmful chemicals, such as VOCs, and contribute to indoor air pollution. The smoke from incense and candles can trigger allergic reactions and respiratory issues, especially in individuals with pre-existing conditions. To maintain good indoor air quality and minimise potential health risks, it is recommended to use natural and organic products, ensure proper ventilation, and opt for alternatives like reed diffusers or candles made from clean-burning waxes such as soy, beeswax, or coconut.
| Characteristics | Values |
|---|---|
| Cost | Incense is cheaper than candles |
| Lasting | Incense lasts longer than candles |
| Intensity | Incense has a stronger smell than candles |
| Reuse | Incense sticks can be used multiple times |
| Health | Burning incense and candles can cause respiratory issues and allergic reactions |
| Ventilation | Incense should be burned in a well-ventilated area |
| Wick | Candles with lead-core wicks can release harmful lead vapors |
| Soot | Candles can cause property damage by blackening walls, ceilings, and carpets |
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What You'll Learn

Incense and candles can cause indoor air pollution
Incense and candles are popular for creating a pleasant fragrance in indoor spaces. However, their regular use contributes to indoor air pollution, posing risks to human health and the environment.
Candles, especially those made with paraffin, a petroleum byproduct, and synthetic fragrances, release harmful chemicals such as volatile organic compounds (VOCs) when burned. The presence of lead-core wicks in some candles is also a significant concern, as they can emit lead vapours, contributing to indoor air pollution and potential health hazards. Even without lead wicks, candles can emit soot, blackening walls, ceilings, and carpets, and affecting indoor air quality.
Incense, composed of natural aromatic substances like resins, barks, seeds, and essential oils, also releases harmful chemicals and particulate matter when burned. The smoke from incense can deposit in the respiratory tract, potentially causing mutagenic effects and skin irritation. The impact of incense smoke is particularly noticeable in poorly ventilated spaces, where it can exacerbate respiratory conditions and increase the risk of adverse health effects.
The frequency and duration of burning incense and candles are critical factors influencing the associated health risks. Regular and prolonged exposure to the pollutants released by these sources can lead to the accumulation of harmful chemicals and fine particulate matter in the indoor environment, negatively impacting air quality and human health.
To mitigate the risks associated with incense and candle use, it is essential to ensure proper ventilation and moderation in their usage. Understanding the potential dangers of these products is crucial for maintaining a healthy indoor environment and making informed choices about their use in our homes.
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Burning incense and candles may release harmful chemicals
The amount of exposure to these chemicals is essential to consider, as the health risks are directly related. Children and individuals with respiratory illnesses are advised to avoid places with indoor incense burning. To reduce exposure, one can limit burning time, opt for natural plant-based incense, ensure adequate ventilation, or choose healthier alternatives like essential oils.
Similarly, scented candles have been found to release harmful chemicals, particularly when made from paraffin wax. A study by South Korean researchers in 2015 concluded that scented candles release volatile organic compounds (VOCs) before and during burning, contributing to indoor air pollution. These compounds can cause headaches, eye and throat irritation, nausea, and even damage to vital organs like the liver and kidneys.
Candles with lead-core wicks, though banned in the US in 2003, can release hazardous levels of lead when burned. Exposure to high amounts of lead has been linked to hormone disruption and various health issues. To minimize risks, it is recommended to choose candles made from natural materials like beeswax or soy wax and scented with essential oils rather than synthetic perfumes.
Both incense and candles can contribute to indoor air quality problems, and it is important to be cautious of the potential health risks associated with their use. While they can enhance the ambiance and scent of a space, it is advisable to prioritize health and opt for healthier alternatives when possible.
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Incense and candles can trigger allergic reactions
Burning incense and candles can trigger allergic reactions and respiratory issues. The smoke released from incense and candles contains particulate matter that can be easily inhaled and may have negative health outcomes. The particulate matter produced by burning incense and candles can deposit in the respiratory tract and cause a variety of health effects, including mutagenic effects and airborne dermatitis. Incense smoke has also been associated with an increased risk of heart disease and may affect heart tissues, deposit harmful substances in the body, and contribute to overall inflammation.
In some cases, allergic reactions to incense can be more severe than a simple respiratory issue. Some people experience an anaphylactic reaction, with symptoms such as itching all over the body. Individuals with Multiple Chemical Sensitivity Syndromes may also experience various symptoms, including chemical exposures in the environment, such as incense, perfume, fragrant candles, and laundry detergent. Prolonged exposure to incense smoke can also lead to skin irritation, headaches, forgetfulness, and difficulty concentrating.
Candles with lead-core wicks have been found to be a source of airborne lead when burned, releasing harmful chemicals as they burn. Lead was commonly used as a core material until 1974 when the U.S. candle manufacturing industry agreed to discontinue its use. However, candles with lead wicks have still been found on the market. Therefore, it is important to ensure that candle wicks are free of lead and zinc to avoid releasing these harmful chemicals.
Strong fragrances in candles can also trigger hay fever symptoms, causing sneezing, coughing, and a stuffy, runny, or itchy nose. These symptoms may be caused by an allergic reaction to fragrances, where the immune system overreacts, or because the scent irritates the airways directly.
To minimize the risk of allergic reactions and respiratory issues, it is recommended to burn incense in a well-ventilated area or opt for smoke-free alternatives, such as loose grain incense or frankincense crystals heated over a tealight burner or a heat source. For candles, choosing soot-free options made from 100% beeswax or vegetable-based waxes can help reduce indoor air pollution.
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Incense and candles can cause property damage
Incense and candles are composed of a blend of natural and synthetic materials, which, when burned, can release harmful chemicals. The combustion of incense and candles releases fine particulate matter (PM2.5) and volatile organic compounds (VOCs), including harmful chemicals like benzene and formaldehyde. These pollutants, especially particulate matter, can easily be inhaled, posing health risks by irritating or damaging the respiratory system.
In addition to the health risks, candles and incense can also cause property damage. Candles with lead-core wicks have been found to be a source of airborne lead when burned. Metal cores are used to stiffen wicks so they will not fall over and extinguish themselves as the surrounding wax melts. Lead was commonly used as a core material until 1974 when the U.S. candle manufacturing industry voluntarily agreed to discontinue the use of lead in wicks. However, candles with lead wicks have still been found on the market, particularly in imported candles. When burned, these candles release lead vapors, which can contaminate walls, ceilings, and carpets, causing property damage.
Furthermore, under imperfect combustion conditions, candles can emit soot, blackening walls, ceilings, and carpets. The amount of soot produced can vary depending on the type of candle, with some candles producing up to 100 times more soot than others. Incense smoke is also a major source of particulate emissions, which can deposit in the respiratory tract and cause various health effects, including mutagenic effects and airborne dermatitis.
To minimize the risks of property damage and health hazards associated with candles and incense, it is recommended to choose soot-free candles made from 100% beeswax or vegetable-based waxes. Burning candles and incense in well-ventilated areas and ensuring proper candle hygiene, such as trimming wicks and avoiding drafts, can also help reduce the impact of pollutants. Additionally, it is crucial to always blow out candles and extinguish incense before leaving a room or going to bed and to keep them out of reach of children and pets.
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Diffusers are a safer alternative to candles and incense
While scented candles and incense sticks are popular choices for adding a pleasing aroma to a room, they do come with some safety concerns. A safer alternative is to use a diffuser filled with pure, organic essential oils.
Both candles and incense contribute to indoor air quality problems. Candles with lead-core wicks have been found to release airborne lead when burned. Metal cores are used to stiffen wicks, but lead is toxic and should be avoided. In addition, candles can emit soot, particularly under imperfect combustion conditions, which can cause property damage by blackening walls, ceilings, and carpets. The amount of soot produced varies depending on the type of candle, with some producing up to 100 times more soot than others.
Incense smoke can also be a major source of particulate emissions in indoor air. The particulates produced when burning incense can deposit in the respiratory tract and may contain contaminants that can cause a variety of health effects, including mutagenic effects and airborne dermatitis. Therefore, it is important to only burn incense in a well-ventilated area and to use organic, natural incense.
Diffusers, on the other hand, provide a flameless and safer alternative to scented candles and incense. Reed diffusers, for example, consist of reeds placed into a vessel of scented diffuser oil, which gently releases the fragrance into the surrounding air. The reeds can be left unattended without posing a fire safety risk, as nothing is left burning. Electric diffusers are another option, which electronically release the fragrance of scented oils as a mist and can be switched on and off as desired.
In summary, while scented candles and incense can add a delightful aroma to a room, they do have some safety concerns related to indoor air quality and fire hazards. A safer alternative is to use diffusers, which provide a flameless and fire-safe way to enjoy a continuous stream of fragrance in your home.
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Frequently asked questions
Burning incense and candles both have their pros and cons. Incense is cheaper and lasts longer. It also allows you to quickly change the ambiance of a room. However, incense should never be left unattended and can be overwhelming. On the other hand, candles are safer and can be left unattended. They also come in a variety of fragrances.
Yes, both incense and candles contribute to indoor air pollution. The smoke from incense and candles can carry allergens that can trigger reactions in sensitive individuals. The EPA found that lead wicks and particulate matter produced by burning candles and incense produce indoor air pollutants.
Reed diffusers are a great alternative to incense and candles. They provide a continuous flameless fragrance and are safer than incense and candles.
Candles with soot-free wicks made of cotton or wood, clean-burning waxes like soy, beeswax, or coconut, and a transparent ingredient list are better for air quality.
Incense that has been dipped in natural oils is better for air quality.











































