Primer
What's actually in your home?
The plastics, the chemicals they carry, the water, and the air. We'll start with microplastics, because that's where the evidence is sharpest, then widen out to the rest of the picture. For the longer version on health stakes, see Why this matters.
Start with the plastics
If you've started reading labels and felt your eyes glaze over, you're not alone. There's a lot in a home: the plastics, the chemicals they carry, the water, the air. We start with microplastics because the science here is the clearest, the most studied, and the easiest to act on. The rest of the picture follows from here.
Microplastics are plastic fragments smaller than 5 millimeters. Nanoplastics are smaller than 1 micrometer, invisible to the naked eye. Both come from the same place: ordinary plastic breaking down. Cookware shedding into food. Cutting boards shedding into the cut. Tea bags releasing into the cup at brewing temperature. Polyester sheets shedding fibers into bed dust.
They're in human blood, brain tissue, and arterial plaque. The interesting question stopped being do they accumulate and became which exposures move the number most.A lot of the answer is at home, and so are the chemicals plastics carry, the water you drink, and the air you breathe. We cover all of it. Plastics are simply where the evidence is sharpest, so it's where we begin.
Where they enter your home
Six common entry points.
These aren't exhaustive, and plastics aren't the only thing we track. They're the entry points doing the most damage in most homes, and the items readers ask us about first. Water and air come next.
Cookware
Nonstick coatings shed at heat. Black plastic utensils contain flame retardants from recycled electronics that leach at cooking temperatures (Univ. of Amsterdam, 2024).
Cutting boards
A typical household plastic board sheds 50+ grams of microplastic per year, directly into the food being cut on it (Environmental Science & Technology, 2023).
Tea bags
One nylon pyramid bag releases ~11.6 billion microplastic particles into a cup at brewing temperature (McGill, 2019). The shape that markets premium is the shape that shreds.
Bottled water
240,000 plastic particles in the average liter, per a Columbia / NEJM study using new imaging methods.
Sheets and pillows
Eight hours per night of skin contact with synthetic fiber. The sheets shed microfibers into bed dust that you breathe.
Shower curtains
PVC off-gasses phthalates and VOCs (the 'new shower curtain' smell is real). Steam accelerates the breakdown.
Start here
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