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Ethylene oxide (EtO) is a colourless, flammable, and reactive gas commonly used for sterilisation and chemical manufacturing. It is a contaminant of concern for the United States Environmental Protection Agency (USEPA) and is listed as a hazardous air pollutant (HAP) under the Clean Air Act (CAA). While it is not expected to persist in the environment for long due to its physical properties, ethylene oxide has been identified as a human carcinogen, with studies showing an increased risk of cancer in workers exposed to it. The potential health effects of ethylene oxide exposure depend on the amount inhaled and the duration of exposure, with short-term exposure causing irritation to the eyes and mucous membranes, and long-term exposure leading to potential damage to the brain and nervous system.
| Characteristics | Values |
|---|---|
| Persistence in air | Not persistent due to washout by rain and degradation by chemical processes |
| Persistence in food products or water | Very unlikely to remain due to its quick evaporation |
| Persistence in soil or water | Not anticipated to persist as it volatilizes rapidly |
| Persistence in the general environment | Unlikely to be found |
| Persistence in the human body | Leaves the body through exhalation, urine, and faeces |
| Persistence in the workplace | Safe Work Australia sets the workplace exposure standard for ethylene oxide |
| Persistence in urban areas | Measured using tunable infrared laser direct absorption spectrometry (TILDAS) in Toronto, Canada |
| Persistence in sterilization facilities | Releases to ambient air have gained attention |
| Persistence in hospitals | No detectable EtO found near hospitals |
| --- | --- |
| Other characteristics | |
| Colour | Colourless |
| Flammability | Flammable |
| Reactivity | Highly reactive |
| Odour | Sweet etherlike odour |
| Health effects | Cancer, respiratory irritation, central nervous system depression, irritation of eyes and mucous membranes, skin irritation, eye damage, convulsions, increased rate of miscarriages |
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What You'll Learn
Ethylene oxide is a hazardous air pollutant
Ethylene oxide (EtO) is a hazardous air pollutant. It is a colorless, flammable, and reactive gas commonly used for sterilization and chemical manufacturing. Due to its physical properties, EtO is predominantly transported through the air. It also degrades rapidly, surviving approximately 2–5 months in ambient air, with temperature and humidity being key factors in determining its lifetime. The United States Environmental Protection Agency (USEPA) defines ethylene oxide as a hazardous air pollutant (HAP) and lists and regulates it under the Clean Air Act (CAA).
The potential health effects associated with ethylene oxide exposure depend on the amount inhaled and the duration of exposure. Short-term exposure to high levels of ethylene oxide can cause central nervous system depression and irritation of the eyes and mucous membranes. Long-term exposure can lead to chronic issues such as irritation of the eyes, skin, nose, throat, and lungs, and damage to the brain and nervous system. Studies have also indicated an increased risk of breast cancer in females with long-term exposure.
The National Air Toxics Assessment (NATA) is a screening tool used by the EPA to identify areas, pollutants, or pollution sources that require further examination. NATA estimates the potential risk of developing cancer and other serious health effects from exposure to air toxics across the United States. While NATA does not estimate individual risk, it helps the EPA understand the overall cancer risk due to air toxics and identify areas of concern.
To address ethylene oxide emissions, the EPA has existing National Emissions Standards for Hazardous Air Pollutants (NESHAPs) for industries that emit this pollutant. The EPA is currently conducting Risk and Technology Reviews (RTRs) for the Miscellaneous Organic NESHAP and the Ethylene Oxide Emissions Standards for Sterilization Facilities NESHAP to reduce emissions and protect public health.
Overall, ethylene oxide is a hazardous air pollutant that poses significant risks to human health, and regulatory efforts are ongoing to mitigate its impact on the environment and the public.
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It is a colourless, flammable, reactive gas
Ethylene oxide (EtO) is a colourless, flammable, and reactive gas. It has a sweet ether-like odour and is irritating. It is commonly used for sterilisation and chemical manufacturing. Due to its physical properties, EtO is predominantly transported through the air. It is highly reactive and will completely dissolve in water.
The United States Environmental Protection Agency (USEPA) defines ethylene oxide as a hazardous air pollutant (HAP) listed and regulated under the Clean Air Act (CAA). It is also regulated under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) as an antimicrobial agent. The World Health Organization estimates the half-life of EtO in soil and groundwater to be around 10 to 12 days, and it is not expected to accumulate in the environment.
The potential health effects of ethylene oxide exposure depend on the amount inhaled and the duration of exposure. Short-term exposure can cause irritation to the eyes and mucous membranes, while long-term exposure can lead to chronic issues such as irritation of the eyes, skin, nose, throat, and lungs, as well as damage to the brain and nervous system. Studies have also shown a link between long-term exposure and an increased risk of breast cancer in females.
The EPA has classified ethylene oxide as a human carcinogen, and it is considered a probable carcinogen by Worksafe Australia. The EPA's National Air Toxics Assessment (NATA) has identified ethylene oxide as a potential risk in some parts of the country, and the agency is working to reduce emissions and regulate industries that emit this hazardous air pollutant.
While ethylene oxide is a concern due to its toxicity and potential health effects, it is not expected to persist in the environment for extended periods due to its reactive nature and rapid degradation. However, its presence in the air and potential impact on human health are serious issues that regulatory agencies are actively addressing.
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Short-term exposure can cause irritation to eyes and mucous membranes
Ethylene oxide (EtO) is a colourless, flammable, and reactive gas commonly used for sterilisation and chemical manufacturing. It is listed and regulated under the Clean Air Act (CAA) as a hazardous air pollutant (HAP) and is classified as a human carcinogen. Short-term exposure to high levels of ethylene oxide can cause irritation to the eyes and mucous membranes, including the mouth, nose, and throat.
The effects of short-term exposure to ethylene oxide depend on the amount inhaled and the duration of exposure. Even at low levels, ethylene oxide can cause irritation to the eyes and mucous membranes. At higher concentrations, it can cause more severe respiratory irritation, such as coughing, shortness of breath, and wheezing. Additionally, short-term exposure can lead to dizziness, nausea, headaches, and fatigue. In some cases, it may also cause vomiting and other types of gastrointestinal distress.
The United States Environmental Protection Agency (USEPA) has established health values for ethylene oxide exposure, which are significantly more toxic than previously estimated. The new health value is 60 times more toxic to children and 30 times more toxic to adults. These values are incorporated into the National Air Toxics Assessment (NATA), which helps identify areas, pollutants, and sources for further examination. NATA provides broad estimates of the risk of developing cancer and other serious health effects but does not assess individual risk.
While ethylene oxide is not expected to persist in the environment for long periods due to its rapid degradation and evaporation, short-term exposure can still pose significant health risks. It is essential to follow workplace exposure standards and safety guidelines to minimise the potential hazards associated with ethylene oxide exposure.
In summary, short-term exposure to ethylene oxide, even at low levels, can irritate the eyes and mucous membranes. Higher concentrations and prolonged exposure can exacerbate these effects and lead to more severe health consequences. Understanding the potential risks associated with ethylene oxide exposure is crucial for implementing appropriate safety measures and mitigating its impact on human health.
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Long-term exposure can cause damage to the brain and nervous system
Ethylene oxide (EtO) is a colourless, flammable, and reactive gas. It is predominantly transported through the air and can enter the body when air containing ethylene oxide is inhaled. The potential health effects associated with exposure to ethylene oxide depend on the amount inhaled and the duration of exposure.
Long-term exposure to ethylene oxide can cause damage to the brain and nervous system. This includes problems with brain and nerve functions and irritation of the eyes, skin, nose, throat, and lungs. Some evidence also indicates that exposure to high levels of ethylene oxide can cause an increased rate of miscarriages in female workers.
In addition to the nervous system, long-term exposure to ethylene oxide can also impact the reproductive system, causing reproductive problems and lower fertility rates. It is also associated with an increased risk of cancer, including breast cancer in females and cancers of the white blood cells, such as non-Hodgkin lymphoma, myeloma, and lymphocytic leukemia.
The United States Environmental Protection Agency (USEPA) has classified ethylene oxide as a hazardous air pollutant (HAP) and is taking steps to reduce its presence in the air. While ethylene oxide does not persist long-term in the environment due to its rapid degradation, it is still a contaminant of concern due to its potential health effects.
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It is classified as a human carcinogen
Ethylene oxide (EtO) is a colourless, flammable, and reactive gas commonly used for sterilisation and chemical manufacturing. It is listed and regulated under the Clean Air Act (CAA) as a hazardous air pollutant (HAP) by the United States Environmental Protection Agency (USEPA).
In December 2016, the EPA classified ethylene oxide as a human carcinogen. This classification was based on studies showing that exposure to ethylene oxide is associated with an increased risk of certain types of cancers in humans. These include cancers of the white blood cells, specifically the infection-fighting cells of the immune system, and breast cancer in females. The EPA's National Air Toxics Assessment (NATA) is a screening tool that helps identify areas, pollutants, or pollution sources that require further examination. NATA provides broad estimates of the risk of developing cancer and other serious health effects, but it does not estimate individual risk.
The health effects associated with exposure to ethylene oxide depend on the amount inhaled and the duration of exposure. Short-term exposure to high levels of ethylene oxide can cause acute health effects such as dizziness, nausea, respiratory irritation, and gastrointestinal distress. Long-term exposure to ethylene oxide, on the other hand, can lead to chronic health issues such as irritation of the eyes, skin, nose, throat, and lungs, as well as damage to the brain and nervous system.
The EPA has established cancer risk values for ethylene oxide and is working to reduce ethylene oxide emissions through regulations and emission standards for industries that release this hazardous air pollutant.
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Frequently asked questions
Ethylene oxide is a hazardous air pollutant that does not persist in the environment for long due to its high reactivity and evaporation rate.
Short-term exposure to high levels of ethylene oxide can cause irritation to the eyes and mucous membranes, dizziness, nausea, respiratory irritation, and in some cases, vomiting and gastrointestinal distress. Long-term exposure has been linked to an increased risk of cancers, particularly in females, and damage to the brain and nervous system.
The United States Environmental Protection Agency (USEPA) regulates ethylene oxide as a hazardous air pollutant under the Clean Air Act and as an antimicrobial agent under the Federal Insecticide, Fungicide, and Rodenticide Act.
Industries that emit ethylene oxide include the chemical industry, healthcare, and agricultural product fumigation. The EPA is currently reviewing and updating National Emissions Standards for these industries to reduce ethylene oxide emissions.
The National Air Toxics Assessment (NATA) is a screening tool used by the EPA to estimate the potential risk of developing cancer and other serious health effects due to air toxics across the United States. It does not, however, estimate individual risk.
