Ethan Clarke
Plastic is an indispensable part of our daily lives, but not all plastics are equal in terms of their environmental and health impact. Some plastics are more harmful due to their complexity and toxicity during manufacturing, and the challenges associated with recycling or degrading them. Polystyrene, black plastics, #3 PVC, and #7 PC plastics are considered the most toxic and hardest to recycle. Polystyrene, for example, releases over fifty chemical byproducts during manufacturing, contaminating the air, water, and communities near production facilities. Similarly, PVC is known to leach toxins throughout its entire life cycle, and its difficult recyclability makes it one of the most environmentally damaging materials. Other dangerous plastics include lightweight plastic bags, which are lethal to ocean animals, and nylon, which is commonly found in fishing nets and generates plastic microfibers that pollute oceans and harm marine life.
| Characteristics | Values |
|---|---|
| Type | Polystyrene, #3 PVC, #6 PS, #7 PC, black plastics, LDPE |
| Toxicity | Releases over fifty chemical byproducts during manufacturing, including styrene, a known carcinogen |
| Recyclability | Difficult to recycle, generates microplastics that contaminate soils and oceans |
| Environmental Impact | Harmful to ocean animals, such as turtles, who mistake plastic bags for jellyfish and then starve when plastic blocks their stomachs |
| Human Health Impact | Linked to increased risks of leukemia, lymphoma, and other cancers, as well as negative effects on the central nervous system |
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What You'll Learn
- Polystyrene: toxic, hard to recycle, and contaminates air, water, and communities
- Black plastics: considered toxic for human health and non-recyclable
- PVC (#3): releases toxins, contains toxic additives, and is difficult to recycle
- PC (#7): leaches bisphenol A (BPA), an endocrine disruptor, and is hard to recycle
- Fishing nets: highly resistant, generate plastic microfibers, and kill ocean wildlife
Polystyrene: toxic, hard to recycle, and contaminates air, water, and communities
Polystyrene, often mistakenly referred to as Styrofoam, is one of the most harmful types of plastic packaging. It is made up of multiple styrene molecules, which are reasonably anticipated to be human carcinogens. Styrene exposure has been linked to increased risks of leukemia, lymphoma, and other cancers. It is especially harmful when consumed with food, as the amount of styrene that leaches into food depends on the time spent in contact with polystyrene, the surface area of contact, and the type and temperature of the food (with higher temperatures and higher fat foods leading to more styrene passing into the food). The Occupational Safety and Health Administration (OSHA) warns that prolonged or regular exposure to styrene can negatively affect the central nervous system, leading to symptoms such as depression, headaches, fatigue, and weakness, and potentially impacting kidney function.
Polystyrene is not only harmful to human health but also difficult to recycle. When fragmented, it generates microplastics that contaminate soils and oceans. This plastic is widely used in fast-food containers, packaging, and protective materials, posing significant environmental challenges.
The manufacturing process of polystyrene further exacerbates its negative impact. Over fifty chemical byproducts are released during production, contaminating the air, water, and communities living near these facilities. The US Plastics Pact considers polystyrene (#6 PS) problematic and harmful, emphasizing the urgent need to shift towards more recyclable and less toxic alternatives.
To address the issues posed by polystyrene, organizations like Eco-Cycle advocate for the use of plastics with better recycling markets, such as #1 PET, #2 HDPE, and #5 PP. These alternatives are not only more recyclable but also generally less toxic, reducing the overall harm caused by plastic pollution. Additionally, the development and implementation of advanced recycling methods, such as chemical and enzymatic recycling, can help process previously non-recyclable plastics, promoting a more sustainable and circular economy.
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Black plastics: considered toxic for human health and non-recyclable
Plastic is not created equal, and some types are more harmful than others. Black plastics are considered one of the most toxic and difficult-to-recycle types of plastic.
Black plastics are commonly used for kitchen utensils, toys, and single-use food containers. They are made black by adding a substance called carbon black, which contains polycyclic aromatic hydrocarbons (PAHs) with carcinogenic properties. The International Agency for Research on Cancer (IARC) has classified carbon black as "possibly carcinogenic to humans." While it is unknown if carbon black leaches out of black plastic containers into food during microwaving, it is generally not recommended to microwave food in any plastic container.
Black plastics are more likely to contain unregulated amounts of toxic chemicals, including heavy metals and flame retardants, which can leach into food and pose significant risks to human health. A 2018 University of Plymouth study found toxic chemicals in 40% of the black plastic items tested, including toys, thermoses, cocktail stirrers, and utensils. These items contained toxic chemicals at levels 30 times higher than what is considered safe. Another study by Toxic Free Future and Vrije Universiteit Amsterdam, published in Chemosphere in 2024, found high levels of cancer-causing, hormone-disrupting flame retardant chemicals in various household products made with black plastics. These toxic chemicals can cause serious reproductive and developmental issues, even at very low levels.
Additionally, black plastics are not easily recyclable due to their colour. The technology used by recycling facilities to sort plastics relies on infrared light, which carbon black absorbs, making it challenging for the facilities to detect black plastics. As a result, the majority of black plastics are not recycled, contributing to environmental waste.
Overall, black plastics pose a significant risk to human health due to their toxic chemical composition and their difficulty in being recycled makes them harmful to the environment as well. It is essential to raise awareness about the dangers of black plastics and encourage the use of safer, more recyclable alternatives.
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PVC (#3): releases toxins, contains toxic additives, and is difficult to recycle
Polyvinyl Chloride (PVC), also known as Plastic #3, is one of the most harmful types of plastic. It is toxic at every stage of its life cycle, from production to disposal, and is difficult to recycle.
PVC production is energy-intensive and requires toxic chemicals such as chlorine gas, vinyl chloride monomer (VCM), ethylene dichloride (EDC), and other pollutants. These chemicals contaminate the air, water, and soil, posing risks to both human health and the environment. Vinyl chloride, a primary building block of PVC, is a potent carcinogen and one of the most commonly released industrial chemicals. It has been linked to increased cancer risks for residents living near plastic manufacturing sites, with some communities experiencing health risks and even abandonment due to vinyl chloride and plastic production.
PVC is naturally rigid and prone to degradation when exposed to heat or light. To address these issues, it is often filled with toxic additives, such as plasticizers to make it flexible. These plasticizers can disrupt the body's messaging system, harm reproductive health, and contribute to asthma and developmental problems. Toxic metals like lead, cadmium, and organotins are added as stabilizers, while toxic flame retardants are included to prevent fires. These additives can leach from the plastic during use, contaminating the environment and exposing people to harmful substances.
The disposal of PVC is also problematic. Due to its chlorine content, burning PVC creates more dioxin, a highly toxic compound linked to cancer, diabetes, heart disease, nervous system disorders, and other serious health issues. Landfilling PVC leads to dioxin poisoning of landfills and groundwater. Recycling PVC is challenging due to its various formulations and additives, making it nearly impossible to separate and recycle effectively.
Given the toxic nature and recycling difficulties associated with PVC, it is considered one of the most dangerous plastics. Efforts are being made to limit or phase out its use, with some countries implementing restrictions on PVC or its additives. However, PVC remains prevalent in everyday products, highlighting the need for safer alternatives and a global shift towards more recyclable and less toxic plastics.
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PC (#7): leaches bisphenol A (BPA), an endocrine disruptor, and is hard to recycle
Plastic is everywhere, from our water bottles to our clothes, furniture, and food containers. However, not all plastics are the same, and some are more harmful than others. Polystyrene (#6), black plastics, PVC (#3), and PC (#7) plastics are considered the most toxic and hardest to recycle.
PC (#7) plastic, or polycarbonate, is particularly harmful as it contains bisphenol A (BPA), a synthetic chemical that is known to leach into food and beverages from containers, especially when heated. BPA is an endocrine disruptor, meaning it interferes with the body's hormones. It has a weak binding affinity for the estrogen receptors ERα and ERβ and can also activate other receptors such as the membrane receptor GPER (GPR30) and estrogen-related receptors (ERRs). This can lead to a range of health issues, including insulin resistance, type 2 diabetes, and altered immune response, behavioural problems, accelerated puberty, and increased susceptibility to tumour growth and various types of cancer, such as breast, ovarian, prostate, and colon cancer.
The degree of BPA leaching depends on factors such as temperature, with higher temperatures increasing the amount of BPA that leaches into the contents. BPA exposure is widespread, with detectable levels found in 93% of urine samples from people aged six years and older in a 2003-2004 US study. It can also be passed through breast milk and the placenta, affecting foetal development.
Due to the health concerns associated with BPA, some countries have banned its use in certain products, and "`BPA-free`" alternatives have emerged. However, these replacement plastics may not be safe either, as some exhibit even higher levels of estrogenic activity than BPA-containing plastics.
Overall, PC (#7) plastic is considered dangerous due to its BPA content, which has endocrine-disrupting effects and is challenging to recycle.
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Fishing nets: highly resistant, generate plastic microfibers, and kill ocean wildlife
While polystyrene, black plastics, #3 PVC, and #7 PC plastics are considered the most toxic and difficult to recycle, they are not the most dangerous. The most dangerous type of plastic is one that is often overlooked: fishing nets.
Fishing nets are highly resistant, generating plastic microfibers and killing ocean wildlife. They are made from strong and cheap materials like nylon, which do not decompose. When these nets are lost or abandoned in the ocean, they become "ghost nets". These ghost nets continue to trap fish and other marine life, such as sea turtles, dolphins, porpoises, birds, sharks, and seals, for many years. The entangled animals are unable to move freely, leading to injuries and suffocation.
The issue of ghost nets is not new, yet it remains a significant concern. Research has shown that none of the 15 largest fishing companies in the world are actively addressing this problem. The abandonment of fishing nets in the sea not only harms marine life but also destroys coral reefs and endangers ships, which can become stuck in their propellers.
Ghost nets contribute to the ocean plastics crisis as they break down into smaller pieces of plastic. Marine animals mistake these microplastics for food, leading to internal organ damage, starvation, and exposure to toxic chemicals. According to a 2018 study, ghost nets make up at least 46% of the Great Pacific Garbage Patch.
To combat the ghost net problem, organizations like Sea Shepherd and WWF are working to remove these nets from the oceans and advocating for solutions such as traceable fishing gear and refundable deposits on nets to encourage recycling and reduce littering.
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Frequently asked questions
Polystyrene, black plastics, #3 PVC and #7 PC plastics are considered the most toxic and hardest to recycle. Over fifty chemical byproducts are released during the manufacturing of polystyrene, contaminating the air, water, and communities that live near these facilities. Styrene, a main component of polystyrene, is identified by the US Department of Health and Human Services as “reasonably anticipated to be a human carcinogen.”
Discarded fishing nets, often called ghost gear, are a type of deadly ocean plastic. Designed to catch and kill wildlife, they are very lethal when floating in the ocean. Plastic bags are also one of the most lethal plastic killers of ocean animals. They escape and float easily in the air and water, travelling long distances. Small animals, seabirds and turtles get entangled in them and drown.
All plastic has a negative impact on the climate, but certain plastics require production processes that consume large amounts of resources and release harmful chemicals. PVC is one of the most versatile plastics, used in pipes, windows, and packaging, but its environmental impact is concerning. It contains toxic additives such as stabilizers and plasticizers, which can be released during its manufacturing, use, and decomposition.
Polystyrene, #6 PS, #3 PVC, #7 PC, and black plastics should be avoided as they are considered "problematic and harmful" by the US Plastics Pact. There are no scalable recycling markets for #3, #6, and #7 plastics.
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