Heidi Norton
Burning incense is a common practice in many parts of the world, especially in religious and cultural contexts. However, it is important to be aware of the potential health risks associated with it. Incense smoke contains particulate matter, gases, and chemicals that can negatively impact indoor air quality and have adverse effects on human health. One of the primary concerns is the emission of carbon monoxide (CO), a toxic gas that can cause various health issues, from headaches and dizziness to more severe consequences, including respiratory and cardiovascular problems. This raises the question: does incense set off carbon monoxide alarms, and what are the implications for indoor air pollution and human health?
| Characteristics | Values |
|---|---|
| Carbon Monoxide Emissions | Incense emits carbon monoxide (CO) in large quantities compared to other indoor sources. |
| Health Risks | Burning incense can cause respiratory and cardiovascular issues, alter host defenses, damage lung tissue, and potentially contribute to cancer. |
| Comparison to Cigarettes | Incense produces approximately 180-220 mg of CO per gram burned, while a typical cigarette produces 60 mg of CO. |
| Indoor Air Pollution | Incense burning is a significant source of indoor air pollution, especially in enclosed spaces with low ventilation. |
| Pollutants | In addition to CO, incense smoke contains sulfur dioxide (SO2), nitric oxide (NO), benzene, toluene, methyl chloride, methylene chloride, formaldehyde (HCHO), carbonyls, and volatile organic compounds (VOCs). |
| Adverse Health Effects | The health impact of incense smoke depends on exposure duration and intensity. Symptoms can include headaches, dizziness, weakness, and nausea, and high doses of CO can be fatal. |
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What You'll Learn
Incense produces high levels of carbon monoxide
Incense burning, especially indoors, has been identified as a source of air pollution. The smoke from burning incense contains particulate matter, gases, and volatile organic compounds (VOCs). These particles are less than 2.5 micrometers in diameter, which means they can easily be inhaled and cause respiratory issues.
The emission of carbon monoxide (CO) from burning incense has been a particular area of concern. A study by Löfroth et al. found that burning incense produces approximately 180–220 mg of CO per gram of incense burned. While the indoor concentration is usually not expected to exceed the US EPA's outdoor ambient air quality standard for CO of 10 ppm, it can happen if the incense is burned in a small, poorly ventilated room.
Furthermore, a Department of Health-funded project in Singapore investigated carbon monoxide levels in homes and found one home with CO concentrations above World Health Organization (WHO) guideline levels. The source was identified as burning joss or incense sticks. The study found that each joss stick produced as much as 557 mg of CO, significantly more than the 60 mg CO produced by a typical cigarette. Burning just two joss sticks in a sealed room was found to breach the WHO's 1-hour guideline level for CO within an hour.
The health risks associated with carbon monoxide exposure are well-known. Low doses of CO can cause headaches, dizziness, weakness, and nausea. Higher doses can be fatal. Therefore, it is important to ensure proper ventilation when burning incense indoors to mitigate the potential health risks associated with carbon monoxide exposure.
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Burning incense indoors increases air pollution
Burning incense is a religious ritual practised in many cultures and is especially popular among older adults. However, burning incense indoors increases air pollution and can have detrimental effects on health and brain function.
Incense smoke releases several pollutants, including particulate matter (PM), carbon monoxide (CO), carbon dioxide (CO2), sulfur dioxide (SO2), nitrogen dioxide (NO2), volatile organic compounds (VOCs), aldehydes, and polycyclic aromatic hydrocarbons (PAHs). The amount of PM generated by burning incense can be up to 4.5 times higher than that produced by cigarettes.
The emissions of specific compounds from burning incense have been studied, and it was found that incense produces approximately 180-220 mg of CO per gram burned. While the indoor concentration of CO is not likely to exceed outdoor air quality standards, burning incense in a small, poorly ventilated room can lead to higher CO levels.
Additionally, the burning of incense significantly increases the concentrations of benzene, toluene, methyl chloride, and methylene chloride. Benzene and formaldehyde levels in many incense products are above the guideline values established by the WHO, posing a potential danger to users. The emissions of these compounds can increase indoor benzene concentrations above urban air background levels.
The pollutants emitted from incense smoke are associated with accelerated cognitive ageing, intellectual decline, and an increased risk of Alzheimer's disease and vascular dementia. Long-term exposure to incense smoke can also lead to smaller total brain volume and volume in the prefrontal cortex, white matter, and association areas in the frontal and temporal regions. It is crucial to increase ventilation by opening windows during and after burning incense to reduce the concentration of contaminants and mitigate the associated health risks.
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Health risks associated with incense carbon monoxide
Burning incense emits fine particulate matter in large quantities compared to other indoor sources. These particulates are small enough to be inhaled and can cause respiratory issues. The particulate matter in incense smoke contains carcinogens and irritants, which could lead to respiratory diseases such as asthma. Burning incense may also trigger asthma and has been associated with an increased risk of developing respiratory allergies.
Incense smoke has also been linked to an increased risk of heart disease and cancer. However, it is important to note that studies have only found an association between incense use and these diseases, not a direct causal relationship. A 2020 study found that burning incense may negatively impact brain health in older adults over 65, causing issues with cognitive performance and a decrease in brain connectivity.
In addition to particulate matter, burning incense produces gaseous pollutants, including carbon monoxide (CO), nitric oxide (NO), and sulfur dioxide (SO2). Carbon monoxide is a colorless, odorless, and poisonous gas that can reduce the blood's capacity to transport oxygen. Inhalation of carbon monoxide can cause headaches, dizziness, weakness, and nausea, and exposure to high concentrations can be fatal.
The concentration of pollutants emitted by burning incense can be particularly high in small, poorly ventilated spaces. Traditional incense tends to emit higher levels of gaseous pollutants than aromatic incense.
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Incense carbon monoxide levels compared to cigarettes
Incense burning produces particulate matter (PM) in quantities greater than 45 mg/g burned, compared to 10 mg/g burned for cigarettes. The indoor concentration of carbon monoxide (CO) from burning incense is not likely to exceed the US EPA's outdoor ambient air quality standard of 10 ppm unless burned in a small room with low ventilation. However, burning incense emits fine particulate matter in large quantities compared to other indoor sources, and indoor concentrations of PM2.5 can far exceed outdoor concentrations specified by the US EPA's National Ambient Air Quality Standards (NAAQS). This means that incense smoke can pose a health risk to people through inhalation exposure to particulate matter.
The emissions of carbon monoxide from burning incense range from 180-220 mg of CO per gram of incense burned. While the indoor concentration of CO from incense burning is generally lower than the outdoor air quality standard, it can still contribute to overall indoor CO levels, especially in poorly ventilated areas.
Cigarettes, on the other hand, also release carbon monoxide and particulate matter into the air. On average, cigarettes produce 10 mg/g burned of PM, significantly lower than the amount produced by incense burning. However, it is important to note that the carbon monoxide and particulate matter emissions from cigarettes are directly inhaled by the smoker, which can have significant health impacts.
Both incense burning and cigarette smoking contribute to indoor air pollution and can have harmful effects on health. The particulate matter and carbon monoxide emissions from incense burning can accumulate in enclosed spaces, particularly those with low ventilation rates, posing a health risk to individuals in these environments. Similarly, cigarette smoking releases harmful toxins that are directly inhaled by the smoker and can lead to respiratory issues and an increased risk of cancer.
In summary, while the carbon monoxide levels from incense burning may not exceed outdoor air quality standards, they can still contribute to overall indoor CO levels, especially in poorly ventilated spaces. Cigarettes produce lower levels of particulate matter but release carbon monoxide and toxins directly inhaled by the smoker, with potential short-term and long-term health consequences. The health effects of incense burning and cigarette smoking are well-documented, and it is important to be mindful of the impact of these activities on indoor air quality and personal health.
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Incense carbon monoxide in urban areas
Incense burning is a common tradition in many Asian countries, used for religious and aesthetic purposes. Incense sticks are also used in homes to mask bad odours and repel mosquitoes, flies, and other insects.
Indoor air pollution resulting from burning incense is a major public health concern. The release of toxic pollutants can quickly accumulate to hazardous levels, especially in poorly ventilated areas. The amount and type of pollutants released depend on the composition of the material used to make the incense sticks. Incense burning generates respirable particulate dust, carbon dioxide, carbon monoxide, volatile organic compounds (VOCs), and carcinogens such as PAHs, carbonyls, and benzene.
In a study by Löfroth et al., it was found that burning incense produces approximately 180–220 mg of carbon monoxide per gram of incense burned. However, the authors concluded that the indoor concentration is unlikely to exceed the US EPA's outdoor ambient air quality standard of 10 ppm, unless burned in a small room with low ventilation.
Another study monitored carbon monoxide levels in 56 homes across three cities in the UK during the winter of 2002/2003. The homes were selected as part of the UK government's Warm Front evaluation programme, targeting fuel poverty and potentially problematic gas appliances that could emit higher-than-average amounts of carbon monoxide.
While the specific impact of incense burning on carbon monoxide levels in urban areas was not quantified, the practice contributes to indoor air pollution and could be harmful to human health, especially in enclosed spaces with poor ventilation.
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Frequently asked questions
Yes, burning incense does produce carbon monoxide (CO). A recent study funded by the Department of Health found that burning incense can produce 180–220 mg of CO per gram of incense burned.
A study found that burning incense emits fine particulate matter in large quantities compared to other indoor sources. One incense stick can produce as much as 557mg of CO, compared to 60mg CO from a typical cigarette.
Burning incense inside the home has been recognised as a potential source of indoor air pollution. The indoor concentration of carbon monoxide is not likely to exceed the US EPA's outdoor ambient air quality standard for CO of 10 ppm, unless the incense is burned in a small room with a low ventilation rate. However, it is still possible to experience carbon monoxide poisoning from incense if the conditions are right.
