About This Assessment

The Particula Microplastic Exposure Risk Assessment is a free, science-based tool that estimates your personal daily microplastic particle intake across 15 behavioral and environmental factors. Scores are calculated using weighted sub-scores across three domains — daily habits (35%), diet and beverages (40%), and home environment (25%) — with weights reflecting the relative contribution of each pathway to total exposure in published aggregate literature.

The tool was built by Ralph Lopez using published peer-reviewed research as the basis for every scoring heuristic. Each question maps to one or more studies; the specific findings appear in the science notes visible beside each question. Scores represent relative risk compared to population averages — not a medical diagnosis. The tool is designed to help you identify your highest-impact exposure sources and prioritize changes that are most likely to reduce your daily particle intake.

Particle-per-day estimates use a range calibrated to published dietary and inhalation exposure literature: approximately 50 particles/day at the lowest possible score, scaling to approximately 1,250 particles/day at the maximum. Published estimates for average Western diet consumers range from 100–700 particles/day from food alone (Cox et al., 2019; Senathirajah et al., 2021), with total exposure including inhalation ranging substantially higher.

This tool is intended for educational and informational purposes. It does not constitute medical advice. Consult a qualified healthcare professional for health decisions. Created by Ralph Lopez · Particula.com

The Four Microplastic Exposure Pathways

Scientific research has identified four primary routes by which microplastics enter the human body. This assessment covers all four.

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Dietary Ingestion
Microplastics enter food through packaging migration, contamination during processing, and bioaccumulation in seafood. Shellfish are filter feeders that concentrate particles; canned food linings leach plastic compounds; sea salt contains measurable particles from ocean contamination.
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Beverage Contamination
Bottled water averages 325 particles/liter (WHO, 2019). Plastic and nylon tea bags release ~11.6 billion particles per brew (McGill, 2019). Coffee pods leach plasticizers from capsule walls. Tap water contains measurable particles that most basic filters only partially remove.
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Indoor Inhalation
Synthetic carpet fibers, upholstery, and clothing shed microplastic particles into indoor air continuously. Studies find indoor air contains 1.7–16.2 particles/m³. A single washing machine load of polyester releases up to 700,000 fibers (Browne et al., 2011). Air purifiers with true HEPA filters significantly reduce this pathway.
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Cookware Abrasion
PTFE-coated (Teflon) non-stick cookware sheds up to 9,100 microplastic particles per damaged cooking session (Sci. Tot. Environ., 2022). Particle release accelerates dramatically once the coating is scratched or overheated above 260°C. Stainless steel and cast iron are inert alternatives.

Research Basis & Key Citations

The scoring heuristics in this assessment are grounded in peer-reviewed research. The following studies are the primary sources for the quantitative estimates used in each section.

  1. Cox KD et al. (2019). Microplastic intake estimate for Americans. Environmental Science & Technology, 53(12), 7068–7074. doi:10.1021/acs.est.9b01517 — Basis for dietary and inhalation particle-per-day estimates.
  2. Herbes C et al. (2019). Plastic tea bags release microplastics into tea. Environmental Science & Technology, 53(21), 12300–12310. doi:10.1021/acs.est.9b02540 — Source of the 11.6 billion particles per bag figure (McGill University study).
  3. Ragusa A et al. (2021). Plasticenta: First evidence of microplastics in human placenta. Environment International, 146, 106274. doi:10.1016/j.envint.2020.106274 — Evidence of microplastic presence in human tissue; basis for YMYL framing.
  4. Leslie HA et al. (2022). Discovery and quantification of plastic particle pollution in human blood. Environment International, 163, 107199. doi:10.1016/j.envint.2022.107199 — First confirmed detection of microplastics in human blood.
  5. WHO (2019). Microplastics in Drinking Water. World Health Organization — Basis for bottled water particle estimates (avg. 325 particles/L) and tap water comparisons.
  6. Sci. Tot. Environ. (2022). Non-stick cookware PTFE particle release. Science of the Total Environment, 821, 153736. doi:10.1016/j.scitotenv.2021.152772 — Source of the 9,100 particles per damaged-pan cooking session figure.
  7. EFSA CONTAM Panel (2016). Presence of microplastics and nanoplastics in food. EFSA Journal, 14(6), 4501. doi:10.2903/j.efsa.2016.4501 — Shellfish dietary microplastic exposure; basis for 700 particles/serving estimate.
  8. Senathirajah K et al. (2021). Estimation of global population exposure to microplastics. Environmental Pollution, 268, 115940. doi:10.1016/j.envpol.2020.115940 — Updated global dietary intake estimates used to calibrate the scoring range.

Frequently Asked Questions

How many microplastics do humans consume per day?
Research estimates the average person ingests between 39,000 and 52,000 microplastic particles per year from food and drink alone — roughly 100–140 per day. When inhalation is included, the estimate rises significantly. Cox et al. (2019) found 74,000–121,000 particles per year for individuals who breathe indoor air in synthetic-carpet environments.
Are nylon tea bags a significant source of microplastics?
Yes. A landmark 2019 McGill University study found that a single plastic mesh or nylon tea bag releases approximately 11.6 billion microplastic and nanoplastic particles into the cup when steeped at 95°C — orders of magnitude higher than most dietary sources. Switching to loose-leaf tea eliminates this exposure pathway entirely.
What is the most effective water filter for removing microplastics?
Reverse osmosis filtration removes more than 99% of microplastics from tap water. High-quality activated carbon block filters are also highly effective. Standard pitcher filters reduce but do not eliminate particles. Bottled water is not a safer alternative — WHO (2019) found an average of 325 microplastic particles per liter in bottled water samples globally.
What health effects are associated with microplastic exposure?
Microplastics have been detected in human blood, lung tissue, liver, kidney, placenta, and breast milk. Current research is characterizing health implications. Proposed mechanisms include physical tissue irritation, transport of adsorbed chemical pollutants into the body, and endocrine disruption from plastic additives such as BPA and phthalates. The WHO has called for more research while recommending precautionary exposure reduction.
Can you reduce microplastic exposure without changing your diet?
Yes. The highest-impact home interventions are: replacing synthetic-fiber carpeting with hard flooring or natural-fiber rugs; installing a true HEPA air purifier; changing HVAC filters every 1–2 months; and replacing non-stick (PTFE-coated) cookware with stainless steel or cast iron. Indoor airborne microplastics can represent exposure comparable to dietary intake in some homes.