How worried should we be about microplastics in our homes? Norman Swan investigates | 7.30

Key Concepts

• Microplastics: Tiny plastic fragments less than 5 mm in size, originating from the breakdown of larger plastics or intentionally added to products.
• Nanoplastics: Even smaller plastic particles, down to the nanoscale, capable of penetrating biological barriers.
• Sources of Microplastic Exposure: Inhalation, ingestion (food and drink), and dermal absorption.
• Microplastic Degradation: Plastics do not biodegrade within a human lifetime; they fragment into smaller pieces under UV light and through physical action.
• Health Concerns: Potential for inflammation, disruption of growth behavior (observed in animal studies), and possible links to neurodegenerative symptoms (early onset dementia in mice).
• Chemicals in Plastics: Approximately 16,000 chemicals are used in plastics, with many untested for safety and some known to be harmful.
• Petri Dish Analysis: A method used to measure airborne microplastic fibers and particles in a home environment.
• Vacuuming: An effective method for removing microplastic particles from floors and carpets.
• Reducing Microplastic Exposure: Strategies include avoiding plastic food wrap, plastic chopping boards, plastic utensils, non-stick cookware, and plastic containers, especially when heated. Opting for natural fibers in textiles and replacing plastic items with glass alternatives.

Microplastics in the Home: An Investigation

This summary details an investigation into the presence and potential dangers of microplastics within a typical home environment, focusing on the Sydney home of Elellanar Saxon Mills. The core concern is that everyday items, often perceived as safe, can be sources of these pervasive plastic fragments.

The Pervasiveness of Microplastics

The video highlights the widespread nature of microplastics, noting their presence in food and within the human body. Elellanar expresses surprise at the discovery that even tea bags can contain microplastics, illustrating the difficulty of escaping this pollutant. The sheer volume of plastic packaging encountered in everyday shopping, from the fridge to storage containers, underscores the challenge of avoiding plastic in modern life. The use of plastic in dishwashers is also questioned, with a warning that high temperatures can exacerbate microplastic release.

Understanding Microplastics and Their Entry into the Body

Definition and Formation: Microplastics are defined as plastic fragments less than 5 mm in size. They can be:

• Primary microplastics: Intentionally manufactured as small particles for products.
• Secondary microplastics: Resulting from the fragmentation of larger plastic items over time. These fragments do not biodegrade and continue to break down into smaller and smaller pieces, reaching the nanoscale.

Routes of Exposure: The primary ways microplastics enter the human body are:

• Inhalation: Fine particles can settle in the lungs and, due to their size, can move through the bloodstream.
• Ingestion: Consuming food and drinks containing microplastics allows smaller particles to cross the stomach wall and enter the bloodstream.
• Dermal Absorption: Applying products containing microplastics to the skin.

Scientific Investigation and Findings

To assess microplastic exposure in Elellanar's home, petri dishes were placed in various locations over several weeks to collect airborne particles. Dr. Scott Wilson analyzed these samples in a laboratory.

Lab Analysis Results:

• Dominant Pollutant: The analysis revealed that fibers constituted approximately 90% of the microplastics found. These fibers originate from synthetic materials in carpets, clothing, and towels.
• Impact of Fibers: Even at the fiber level, these particles can be inhaled and trapped in the lungs. While larger particles may be coughed out, smaller ones can reside in the lungs and potentially enter the bloodstream.
• Vacuum Cleaner Contents: A sample from Elellanar's vacuum cleaner contained both larger and smaller plastic fragments, indicating that these heavier particles settle on the ground. This is a significant concern for children and babies who crawl on floors.

Location-Specific Findings: The petri dish results revealed surprising concentrations of microplastics:

1. Sunny's Bedroom: This location had the highest concentration, attributed to the presence of synthetic fibers from clothing and potentially nappies.
2. Bathroom: The second highest concentration was found here, with contributions from synthetic fibers and microplastics from cosmetics.
3. Play Area: This area showed a higher proportion of plastic fragments rather than fibers.
4. Kitchen: While some parts of the kitchen had moderate levels, the pantry had a surprisingly low concentration.

Elellanar expressed surprise at her bedroom being the highest, but Dr. Wilson explained that it's the unseen synthetic fibers from everyday items like carpets and clothes that contribute significantly, rather than visible plastic items.

Potential Health Risks and Expert Perspectives

The potential for human harm from microplastics is considered significant due to:

• Untested Chemicals: Plastics contain around 16,000 chemicals, many of which have not been tested for safety.
• Contaminants and Additives: These can include banned substances.
• Nanoplastics: These can potentially reach the brain and cause inflammation.

Animal Studies: Research on animals has shown adverse effects:

• Fish and Invertebrates: Exposure to microplastics in water has led to changes in growth behavior and mortality.
• Mice: A study where mice were exposed to microplastics in their water supply showed them behaving as if they had early-onset dementia.

Dr. Wilson emphasizes that the evidence for harm in humans is not yet solid, but the question remains how long one should wait for definitive proof.

Strategies for Reducing Microplastic Exposure

While a complete elimination of microplastics is challenging, several practical steps can be taken:

Household Changes:

• Food Storage: Avoid wrapping food in plastic wrap.
• Kitchenware:
  • Eliminate plastic chopping boards.
  • Replace plastic utensils that can crumble.
  • Discard non-stick cookware that scratches, as this releases particles.
  • Replace plastic containers with glass alternatives.
• Dishwashers and Microwaves: Do not put plastic items in the dishwasher or microwave, as high temperatures accelerate microplastic erosion.
• Textiles: When renewing carpets or curtains, opt for natural fibers over synthetic blends to reduce the flux of microplastics into the environment.

Maintenance:

• Regular Vacuuming: Consistently vacuuming carpets and floors (whether wooden or carpeted) is crucial for removing settled plastic particles.

Conclusion and Takeaways

The investigation reveals that microplastics are an invisible but significant presence in our homes, originating from a wide array of everyday items. While the direct health impacts on humans are still under investigation, animal studies suggest potential risks. The video advocates for a proactive approach to reducing exposure by making conscious choices about the materials we use in our homes, particularly in the kitchen and in textiles. Regular cleaning, especially vacuuming, is highlighted as a key strategy for mitigating airborne and settled microplastics. The overarching message is to "do what you can" to minimize exposure, acknowledging that collective small changes can influence market demand for more sustainable alternatives.