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Why Pristine, Aged, and Real-World Microplastics Are All Essential for Environmental Research
Summary
Microplastics, tiny plastic bits found everywhere from ice caps to human tissue, are studied in three different ways: clean lab-made particles, lab-particles aged to mimic weathering, and particles collected straight from the environment. This review argues that instead of debating which method is best, scientists should combine insights from all three, since each reveals different pieces of how microplastics behave and potentially harm health. Bringing these approaches together matters because it could lead to clearer, more trustworthy science that regulators can actually use to protect people from plastic pollution.
KEYWORDS: microplastics, testing approach, environmental risk assessment, evidence continuum M icroplastics (MPs) are present everywhere, from Arctic ice cores to human tissues, yet our testing strategies remain fragmented with major gaps in reproducibility and consistency in the interpretation of data.1,2 Each microplastic testing approach, whether pristine, aged, or real-world, serves a unique purpose.However, none of these methods alone can provide the comprehensive evidence that regulators require.It is time to move away from debating which method is "best" and instead focus on integrating these approaches into a unified framework for environmental risk assessment.Currently, three distinct approaches operate largely in isolation (Figure 1).First, pristine MPs exhibit fundamental mechanisms under the best-controlled conditions but lack environmental realism.Second, lab-aged MPs demonstrate how weathering transforms surface chemistry, reactivity, and biological responses.Third, real environmental MPs capture authentic ecological context and actual exposure scenarios.We argue that, rather than treating these as competing methodologies, we should reframe them as complementary components of an evidence continuum.This integrated perspective is essential for designing new tests, interpreting the existing literature, and building the convergent evidence base that environmental policy urgently requires.In this Viewpoint, the term MPs refers to all plastic particles smaller than 5 mm, including nanoscale microplastics, because clear and consistent definitions are essential for integrated risk assessment. ■ PRISTINE MPS STILL MATTER FOR THE MECHANISTIC FOUNDATIONPristine MPs, often criticized for lacking environmental realism, remain indispensable for establishing a mechanistic understanding.Their uniform and well-defined properties