Omar Khalid
Wildfire smoke sometimes smells like burning plastic due to the presence of volatile organic compounds, such as benzene and formaldehyde, which are created when smoke is exposed to sunlight and UV rays. This smell could indicate that the air has become more toxic, with formaldehyde causing irritation to the eyes and throat, and benzene leading to drowsiness, headaches, and an increased heart rate. Similarly, the smell of burning plastic in a house could be a sign of faulty electrical wiring, an overloaded outlet, or an overheating appliance, and it may be necessary to call an electrician or emergency services.
| Characteristics | Values |
|---|---|
| Cause of the smell | Burning electrical wires or appliances, faulty electrical wiring, or wildfires |
| Potential health concerns | Irritation of the eyes and throat, drowsiness, headaches, rapid heart rate |
| Recommended actions | Locate the source of the smell, unplug appliances, shut off power, call an electrician, avoid going out during smoky periods, wear a mask, keep windows and doors closed |
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What You'll Learn
Wildfire smoke and volatile organic compounds
Wildfires emit gases called volatile organic compounds (VOCs) when trees, branches, and leaves, collectively known as biomass, are burned. The variability of emitted compounds depends on the type of fuel burned, fire temperature, smoke age, and fuel moisture. Some of the emitted compounds are hazardous air pollutants, while others can react with oxidants to form secondary air pollutants such as ozone and secondary organic aerosol (SOA).
The atmospheric transformation of primary wildfire emissions can produce SOA and ozone, both of which negatively impact human health. The extent of pollutant formation from wildfire emissions depends, in part, on the speciation of organic compounds. The most detailed speciation of organic compounds has been achieved through laboratory studies, although recent field campaigns are leading to an increase in such measurements.
Over 100 volatile organic compounds were analyzed in air samples from wildfires in Idaho and Washington between 2019 and 2020. The samples were analyzed through thermal desorption-gas chromatography-mass spectrometry, and benzene, toluene, ethylbenzene, xylenes, butenes, phenol, isoprene, and pinenes were observed in the wildfire smoke. Benzene, a known carcinogen, was found to have a sub-chronic cancer risk of 1 extra cancer per million people, and this number ranged from 1 to 19 extra cancers per million for the projected chronic scenarios.
The size and frequency of wildfires in the western United States have been increasing, and this trend is expected to continue, with growing adverse consequences for human health. Wildfires in the Western United States have created smoke that has traveled long distances, even reaching the US's east coast and affecting air quality far from the source.
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Formaldehyde and benzene
When plastic burns, it releases an instantly recognizable chemical, acrid odour. One of the most concerning causes of a burning plastic smell is faulty electrical wiring. This can lead to the insulation, connectors, and wiring catching fire.
Benzene is another Group 1 carcinogen that is released when plastic is burned. Exposure to benzene can cause dizziness, headaches, and, in severe cases, leukaemia. Benzene is a toxic chemical found in polypropylene, a versatile plastic used in various industrial applications, including packaging, automotive, construction, and healthcare. Polypropylene is also used in household appliances due to its heat resistance, non-toxicity, and ease of cleaning.
If you smell burning plastic, it is important to act swiftly to prevent a fire from starting or spreading. Turn off and unplug any associated appliances and call an electrician to determine the cause of the smell.
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Electrical fires and faulty wiring
In the case of electrical fires, the smell of burning plastic is often accompanied by visible smoke or flames. It is important to act quickly to prevent the fire from spreading. If there is an active fire, call 911 immediately. If there is no immediate fire risk, turn off and unplug all associated appliances and shut off the power to the affected area. Even if there is no fire, the presence of a persistent burning plastic smell indicates a serious issue that requires immediate attention by a licensed electrician.
There are several causes of electrical fires and faulty wiring that can lead to the smell of burning plastic. One common cause is overloaded circuits, which occur when too many devices draw power from a single circuit. This can lead to overheating, causing wires to melt and produce a burnt odour. Short circuits, which happen due to damaged insulation or faulty connections, can also generate heat and a burning smell. Faulty sockets, switches, and circuit breakers can create friction, leading to a short circuit and potentially causing parts of the wiring system to melt and catch fire.
Another cause of electrical fires and faulty wiring is outdated or degraded wiring systems. Older homes with outdated electrical systems may lack necessary safety features, increasing the risk of electrical fires. Over time, electrical systems can degrade, and rainwater can seep into wall sockets and switches, causing rust and rot. This can result in a burning smell and potentially lead to electrical faults and fires.
Additionally, faulty appliances and incorrect usage can contribute to electrical fires. Using too many extension cords, overloading outlets with multiple devices, and improper use of power strips can lead to overheating and electrical fires. It is important to follow manufacturer guidelines when using electrical devices and consult a licensed electrician to assess and upgrade outdated equipment.
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Overloaded wall outlets
If you detect a burning plastic smell coming from an electrical outlet, it could indicate a serious problem with your electrical system. This is a warning sign that should not be ignored as it could lead to a serious electrical fire that can spread rapidly and damage your home. Burning plastic releases toxic chemicals into the air, which pose a serious health hazard when inhaled.
One of the most common causes of a burning plastic smell is an overloaded wall outlet or an overloaded circuit. This can happen when too many high-wattage appliances or devices are plugged into the same outlet or circuit. This can cause the wiring and components in the outlet box to overheat, giving off a burning smell and possibly causing a fire. Another cause of an overloaded circuit is when multiple circuits are drawing power from the same electrical circuit, causing the wiring to overheat and potentially causing a power outage.
If you notice a burning smell, it is important to act promptly and safely. First, shut off the power to the affected area at the circuit breaker. If the smell is strong or there are signs of smoke, call an electrician or the fire department immediately. If it is safe to do so, you can try to locate the source of the burning smell. Check for any discolouration, melted plastic, physical damage, or charring near the outlets. If you notice any of these signs, do not use the outlet and call an electrician.
To prevent overloading, it is important to be mindful of the electrical load on your circuits and avoid plugging too many high-wattage appliances into the same outlet or circuit. Regularly inspect your outlets for any signs of wear or damage, such as loose connections, and address any issues promptly.
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Burning insulation and connectors
The smell of burning plastic is often due to faulty electrical wiring. This can lead to burning insulation, connectors, and other parts, which may be hidden, making it challenging to locate the source of the odour. Burning plastic releases ketones and aldehyde gases, which are harmful to breathe.
The smell of burning plastic can also be caused by a malfunctioning or overloaded wall outlet. It is important to act swiftly to prevent a fire from starting or spreading. If there is a specific appliance or area associated with the smell, turn off and unplug all associated appliances and cut the power to that area at the breaker.
If there is no immediate fire risk, but the smell persists, call an electrician to determine the cause and ensure there is no danger. Electricians can also inspect HVAC systems and appliances, which are common sources of burning plastic odours.
Burning plastic smells can also be caused by something as simple as a plastic utensil left on a hot stove or a curling iron that has been left on.
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Frequently asked questions
When trees, branches, and leaves are burned in wildfires, they emit volatile organic compounds. When these compounds react with sunlight and UV rays, they can create benzene and formaldehyde, which smell like burning plastic.
If you smell burning plastic, it could indicate a fire or electrical malfunction. Assess the situation and call 911 if there is smoke or fire. Otherwise, turn off and unplug devices and call an electrician for an emergency visit.
Yes, the presence of formaldehyde in the air can irritate the eyes and throat, while benzene can cause drowsiness, headaches, and an increased heart rate. Both benzene and formaldehyde are Group 1 carcinogens, indicating they can cause cancer.
