by Dr. Mark A. Williams
What if one of the most significant emerging threats to military readiness wasn’t a weapon system or a geopolitical crisis but something invisible, inhaled with every breath and ingested with every meal? Scientists are confirming that micro- and nanoplastics (MNPs), which are tiny, persistent particles shed from plastics, textiles, and tires, are no longer just an environmental issue. They are a human health issue with profound implications for the armed forces. These particles have been found in humans’ lungs, blood, and even the placenta, signaling a widespread internal exposure with the potential to affect force health, performance, and long-term readiness.
The Plastic Invasion: From the Environment to Our Bodies
Microplastics (<5 mm) and their even smaller counterparts, nanoplastics (<1 µm), are born from the breakdown of everyday items, including synthetic clothing, vehicle tires, and packaging. Their microscopic size allows them to contaminate virtually everything, from the deepest oceans to the air in our homes. In fact, indoor air often contains more plastic particles than outdoor air, largely due to shedding from synthetic textiles, furniture, and dust.
The primary exposure pathways into our bodies are:
- Inhalation: breathing in airborne particles from dust, synthetic fibers, rubber vehicle tires, and combustion products like burn-pits and vehicle exhaust.
- Ingestion: consuming contaminated food and water. Ironically, studies show that bottled water, a staple in military operations, can contain significantly more microplastics than tap water, especially when bottles are heated or exposed to sunlight.
Once inside the body these particles are not inert. Evidence shows they can trigger inflammation, cause cellular damage through oxidative stress, and disrupt the function of our mitochondria, which are the powerhouses of our cells. The smallest nanoplastics may even cross crucial biological barriers that are meant to protect our most vital organs.
A Unique Threat to Military Health and Readiness
While MNP exposure is a global concern, military personnel face a distinct and elevated risk. Operational environments create a “perfect storm” for heightened exposure.
- Unique Exposure Scenarios: Deployed settings are often characterized by dust storms, emissions from burn pits, and heavy vehicle exhaust, all of which carry plastic particulates.
- High-Performance Gear: The very uniforms and gear designed to protect service members are often made from high-shedding synthetic textiles, which release a constant stream of microfibers into living and working quarters.
- Enclosed Environments: Life in barracks, on ships, and aboard aircraft means spending significant time in enclosed spaces where plastic particles can accumulate to high concentrations.
This isn’t just a future problem; it’s a readiness issue today. The biological effects of MNPs, including chronic inflammation, respiratory overload, and cardiovascular stress, are directly relevant to a Service Member’s ability to perform under physical duress and to remain deployable. If these particles contribute to long-term conditions like cardiovascular disease or metabolic disorders, they become a crucial factor in the lifelong health of our veterans.
Mitigating the Invisible: Practical Steps to Reduce Exposure
Eliminating exposure to microplastics is impossible in the modern world, but a harm-reduction strategy can significantly lower the risk. The goal is to control and minimize contact wherever possible.
Mitigation Strategy |
Actionable Steps |
Improve Air Quality |
Use high-efficiency particulate air (HEPA) filters in HVAC systems, barracks, and offices to capture airborne particles. Increase ventilation to reduce indoor accumulation. |
Rethink Water Consumption |
Whenever possible, opt for filtered tap water over bottled water. Avoid leaving plastic water bottles in direct sunlight or high heat, as this accelerates particle shedding. |
Handle Plastics Safely |
Avoid microwaving or heating food and beverages in plastic containers. Transfer food to glass or ceramic containers before heating. |
Choose Materials Wisely |
When possible, opt for natural fibers (cotton, wool) over synthetic ones (polyester, nylon) for bedding and personal clothing to reduce microfiber shedding. |
Manage Dust |
Implement enhanced dust-control measures, especially in enclosed environments and in regions prone to dust storms. |
Conclusion: A New Frontier in Force Health Protection
The convergence of evidence is compelling: microplastics are a pervasive internal contaminant with demonstrated biological effects. For the Department of War, this issue is more than an environmental footnote; it is an emerging toxicological threat with plausible effects on operational readiness, recruitment, and the long-term health of Service Members and their families.
Addressing this challenge requires a proactive, multifaceted approach. We must prioritize research into military-specific exposure levels, update procurement standards to favor low-shedding materials, and integrate MNP mitigation into preventive medicine and public health guidance. By treating microplastic exposure with the seriousness it deserves, we can protect our forces and better position the military to lead in the area of environmental health protection for decades to come.
Further Reading:
Campanale C.; Massarelli, C., Savino, I.; Locaputo, V.; & Uricchio, V.F. (2020). “A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health.” International Journal of Environmental Research and Public Health 17(4):1212. https://doi.org/10.3390/ijerph17041212
He, D,; Zhang, K.; Zhang, J.; Wang, X.; Qin, Z.; Chen, W.; Wang, X.; Wang, Y.; Dong, G.; & Wang, D. (2023). “Human Biomonitoring of Micro- and Nanoplastics: A Comprehensive Review.” Environmental Science & Technology 57(39):14371–14392. https://doi.org/10.1021/acs.est.3c03525
Leslie, H.A.; van Velzenet, M.J.M; Brandsma, S.H.; Vethaak, A.D.; Garcia-Vellejo, J.J.; & Lamoree, M.H. (2022). ”Discovery and quantification of plastic particle pollution in human blood;” Environment International 163(107199). https://doi.org/10.1016/j.envint.2022.107199
Mason, S.A.; Welch, V.G.; & Neratko, J. (2018). “Synthetic Polymer Contamination in Bottled Water.” Frontiers in Chemistry 6(407). https://doi.org/10.3389/fchem.2018.00407
Prata, J.C.; da Costa, J.P.; Lopes, I.; Duarte, A.C.; & Rocha-Santos, T. (2020). “Environmental exposure to microplastics: An overview on possible human health effects.” Science of the Total Environment 702(134455). https://doi.org/10.1016/j.scitotenv.2019.134455
Yee, M.S.-L.; Hii, L.-W.; Looi, C.K.; Lim,W.-M.; Wong, S.-F.; Kok, Y.-Y.; Tan, B.-K.; Wong, C.-Y.; and Leong, C.-O. (2021). “Impact of Microplastics and Nanoplastics on Human Health.” Nanomaterials 11(2):496. https://doi.org/10.3390/nano11020496
Dr. Mark A. Williams is a nationally recognized expert in toxicology and environmental health, known for his work on how chemicals, pollutants, and emerging materials affect human and ecological health. Over a 30‑year career, he has held leadership roles at the Department of Defense, NIH, EPA, and top academic medical centers, contributing to major scientific reports, books, and national research initiatives. Dr. Williams is frequently sought for his ability to explain complex scientific issues in clear, practical terms and for his leadership in advancing public‑health protections through evidence‑based toxicology.
