A widely cited estimate puts average weekly microplastic intake around 5 grams — roughly a credit card’s mass — though that figure has drawn methodological criticism. This index tracks 74 daily touchpoints. Green-tagged entries are backed by a specific cited study; the rest describe chemically plausible exposure routes that haven’t been directly measured for that exact product, and are marked accordingly.
Synthetic Signatures
Polycarbonate (PC)
$(C_{15}H_{16}O_2 \cdot CO_3)_n$
Polyvinyl Chloride (PVC)
$(C_2H_3Cl)_n$
Polyethylene Terephthalate (PET)
$(C_{10}H_8O_4)_n$
40+
Cataloged Specimens
5
With Cited Study
74k–121k
Particles/Yr, Ingest.+Inhal.
700k
Fibers Released / Wash Load
Sources: annual intake range — Cox et al. 2019, Environ. Sci. Technol. 53(12); fibers per wash — Napper & Thompson 2016, Marine Pollution Bulletin 112. See specimen citations in the Index for item-level sourcing.
Methodology Note
This catalog distinguishes two tiers of claim. Verified specimens cite a specific peer-reviewed measurement of that product. Unverified specimens describe a chemically plausible exposure route — e.g., a known plastic class that is documented to leach or shed under similar conditions — but no dedicated study measuring that exact product has been identified. Unverified does not mean false; it means unconfirmed at the product level, and such entries should be read as reasoned inference, not measured fact.
Chart 01 — Cited
Microplastics From Water Alone, Per Year
Source: Cox et al. 2019, Environ. Sci. Technol. 53(12), 7068–7074. Figures are drinking-water-only intake for someone who drinks exclusively from one source; not total annual exposure.
Chart 02 — Cited
Primary Sources of Ocean Microplastic
Source: Boucher & Friot 2017, Primary Microplastics in the Oceans, IUCN. Central-scenario shares of primary (directly-released) microplastic mass.
Field Note — Single Serving, Not Annual
The Tea Bag Outlier
Steeping one plastic (“silken” pyramid-style) tea bag at brewing temperature releases an estimated 11.6 billion microplastics and 3.1 billion nanoplastics into a single cup — orders of magnitude higher than any other single-serving food or drink measured to date. This figure describes one cup, not an annual total, and applies specifically to nylon/PET mesh bags, not standard paper string-and-tag bags.
Heat is the primary catalyst for polymer degradation. Using plastic in the kitchen leads to direct ingestion via thermal leaching.
Material
Safety
Thermal Stability
Why?
Platinum Silicone
✅ Safe
230°C+
Inert, no synthetic fillers or off-gassing.
Non-Stick (PTFE)
❌ High Risk
260°C (toxic point)
Chipping leads to ingestion of “forever chemicals.”
Peroxide Silicone
⚠️ Caution
150°C
Can contain fillers that leach at high heat.
Cast Iron
✅ Elite
Infinite
Natural iron transfer is beneficial, no plastic.
Visual Safety Guide: The Pinch Test
Pinch and twist your silicone utensils. If you see a white “crack” or white showing through the colored surface, that is a synthetic chemical filler. Pure platinum-cured silicone stays the same color throughout the pinch.
Section 03
Systemic Runoff Vectors
✓ Verified
Tire & Road Wear (TRWP)
Estimates of tire wear’s share of ocean-bound primary microplastics vary by methodology — the most-cited global model puts it at roughly 28%, second only to synthetic textile laundering. Some narrower ocean-specific estimates run considerably higher; the range itself reflects real scientific disagreement, not a single settled number. Friction between synthetic rubber and asphalt creates fine airborne dust.
Source: Boucher & Friot 2017, Primary Microplastics in the Oceans, IUCN (28.3%, central scenario).
Mitigation: Increase use of public transit, maintain proper tire pressure to reduce friction, and use high-efficiency cabin air filters (HEPA).
✓ Verified
Microfiber Laundry Load
A domestic wash of a roughly 6 kg synthetic laundry load (polyester, polyester-cotton blend, or acrylic) was measured releasing over 700,000 microfibers into wastewater in a controlled study. Later studies using different fabrics and machines have found figures both lower and higher, so treat this as an order-of-magnitude reference rather than a fixed number.