Australians are eating and inhaling significant numbers of tiny plastics at home, new research shows.
These “microplastics,” which are derived from petrochemicals extracted from oil and gas products, are settling in the dust around the house.
Some of these particles are toxic to humans — they can carry carcinogenic or mutagenic chemicals, meaning they potentially cause cancer and/or damage our DNA.
We still don’t know the true impact of these microplastics on human health. But the good news is you can reduce your exposure with three straightforward lifestyle changes:
- Having hard floors
- Using more natural fibers in clothing, furnishings, and homewares
- Along with vacuuming at least weekly
What are microplastics?
Microplastics are plastic particles less than five millimeters across. They come from a range of household and everyday items such as the clothes we wear, home furnishings, and food and beverage packaging.
Our study demonstrates it’s an inescapable reality that we’re living in a sea of microplastics — they’re in our food and drinks, our oceans, and our homes.
People spend up to 90 perce of their time indoors and therefore the greatest risk of exposure to microplastics is in the home.
Our study is the first to examine how much microplastic we’re exposed to in Australian homes. We analyzed dust deposited from indoor air in 32 homes across Sydney over a one-month period in 2019.
We found 39% of the deposited dust particles were microplastics; 42% were natural fibers such as cotton, hair, and wool; and 18% were transformed natural-based fibers such as viscose and cellophane. The remaining 1% were film and fragments consisting of various materials.
Between 22 and 6,169 microfibres were deposited as dust per square meter, each day.
Homes with carpet as the main floor covering had nearly double the number of petrochemical-based fibers (including polyethylene, polyamide, and polyacrylic) than homes without carpeted floors.
Conversely, polyvinyl fibers (synthetic fibers made of vinyl chloride) were two times more prevalent in homes without carpet. This is because the coating applied to hard flooring degrades over time, producing polyvinyl fibers in house dust.
These chemicals can leach from the plastic surface once in the body, increasing the potential for toxic effects. Microplastics can have carcinogenic properties, meaning they potentially cause cancer. They can also be mutagenic, meaning they can damage DNA.
However, even though some of the microplastics measured in our study are composed of potentially carcinogenic and/or mutagenic compounds, the actual risk to human health is unclear.
How much are we exposed to? — Roughly a quarter of all of the fibers we recorded were less than 250 micrometers in size, meaning they can be inhaled. This means we can be internally exposed to these microplastics and any contaminants attached to them.
Using human exposure models, we calculated that inhalation and ingestion rates were greatest in children under six years old. This is due to their lower relative body weight, smaller size, and higher breathing rate than adults. What’s more, young children typically have more contact with the floor and tend to put their hands in their mouths more often than adults.
Children under six inhale around three times more microplastics than the average — 18,000 fibers or 0.3 milligrams per kilogram of body weight per year. They would also ingest on average 6.1 milligrams of microplastics in dust per kg of body weight per year.
For a five-year-old, this would be equivalent to eating a garden pea’s worth of microplastics over the course of a year. But for many of these plastics, there is no established safe level of exposure.
Our study indicated there are effective ways to minimize exposure.
First is the choice of flooring, with hard surfaces, including polished wood floors, likely to have fewer microplastics than carpeted floors.
Also, how often you clean makes a difference. Vacuuming floors at least weekly was associated with fewer microplastics in dust than those that were less frequently cleaned. So get cleaning!