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Quantitative evaluation of global microbead policies: a PMC index approach towards microplastic pollution
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Using a Policy Modeling Consistency index, researchers evaluated 20 microbead policy instruments across global jurisdictions and found that the EU scored highest at 'Perfect' while most others ranked as 'Acceptable,' with common structural gaps including fragmented enforcement, absent Extended Producer Responsibility mechanisms, and undefined biodegradability standards. These inconsistencies mean that intentionally added microplastics in cosmetics and consumer products remain inadequately controlled globally, leaving significant regulatory loopholes that allow continued environmental contamination.
Microbeads, an intentionally added microplastic in cosmetics, rinse-off products and many other consumer products, are a persistent source of primary microplastic pollution. Despite the regulatory efforts, the policies on microbeads remain structurally inconsistent and unevenly enforced. This study applied the Policy Modeling Consistency (PMC) Index to evaluate the internal coherence and structural consistency of 20 microbead policy instruments across multiple jurisdictions worldwide, using nine primary and forty-five secondary variables. The results revealed that the supranational regulation of European Union scored the highest (8.45, “Perfect”), followed by the national regulations of France, Sweden and Portugal in the “Good” category. The remaining sixteen policies scored between 4.3 and 5.9, classified as “Acceptable”. The most common structural gaps included fragmented enforcement, absence of Extended Producer Responsibility mechanisms, limited product category coverage, inadequate exemption categories, ambiguity regarding definitions, lack of standardised biodegradability testing protocols and future monitoring frameworks. Also, a Quintuple Helix (QH) innovation framework based on PMC Index was used to interpret these gaps within a broader governance lens. The QH framework highlighted that the existing governance remains predominantly government-led, with limited participation from industry, academia, and civil society, emphasising the need for more inclusive and adaptive policy models that evolve with innovation and environmental change. The PMC and QH findings highlight that enhancing policy coherence and multi-actor collaboration is essential for building effective and harmonised microbead regulations. Moreover, insights from the results are also used to connect with the ongoing Global Plastics Treaty negotiations, where upstream bans on intentionally-added microplastics are under active consideration. Furthermore, result-based practical policy suggestions were recommended to enhance regulatory consistency and global alignment.
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