<p>The neurotoxin methylmercury in seafood threatens food safety worldwide. China has implemented stringent wastewater policies, established numerous treatment facilities and enforced rigorous water quality standards to address pollution in its waterways. However, the impact of these policies on seafood safety and methylmercury exposure remains unknown. Here we developed a process-based model showing that, although mercury reductions from municipal wastewater policies accounted for only 9% of atmospheric mercury emissions during 1980–2022, these measures unexpectedly prevented <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43016_2024_1093_Article_IEq1.gif" Format="GIF" Height="25" Rendition="HTML" Resolution="72" Type="Linedraw" Width="98" /> </InlineMediaObject> <EquationSource Format="TEX">${\mathrm{102,000}}_{-\mathrm{6,600}}^{+\mathrm{11,000}}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>102,000</mn> </mrow> <mrow> <mo>−</mo> <mn>6,600</mn> </mrow> <mrow> <mo>+</mo> <mn>11,000</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> mercury-related deaths and counteracted nearly two thirds of potential deaths from those emissions. Furthermore, these policies ensured that <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43016_2024_1093_Article_IEq2.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="41" /> </InlineMediaObject> <EquationSource Format="TEX">${146}_{-9}^{+8}$</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>146</mn> </mrow> <mrow> <mo>−</mo> <mn>9</mn> </mrow> <mrow> <mo>+</mo> <mn>8</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> megatonnes of freshwater seafood met the World Health Organization and China’s mercury-safety standards, preventing <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43016_2024_1093_Article_IEq3.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="75" /> </InlineMediaObject> <EquationSource Format="TEX">${\mathrm{US}}\${498}_{-29}^{+32}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">US</mi> <mi>$</mi> <msubsup> <mrow> <mn>498</mn> </mrow> <mrow> <mo>−</mo> <mn>29</mn> </mrow> <mrow> <mo>+</mo> <mn>32</mn> </mrow> </msubsup> </mrow> </math></EquationSource> </InlineEquation> billion in economic losses. Finally, we explore how China, as the primary global seafood producer and exporter, could develop municipal wastewater policies at the regional level to reduce aquatic pollutants and unlock the health benefits of seafood consumption.</p>

China’s municipal wastewater policies enhanced seafood safety and offset health risks from atmospheric mercury emissions in the past four decades

期刊论文
发表日期：

2025年1月2日

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Xingrui Cai,
Mengqi Yang,
Maodian Liu,
Yuang Chen,
Chenghao Yu,
Haoran Zhang,
Qianru Zhang,
Shijun Ma,
Xinyu Dou,
Jing Meng,
Xuejun Wang

摘要

The neurotoxin methylmercury in seafood threatens food safety worldwide. China has implemented stringent wastewater policies, established numerous treatment facilities and enforced rigorous water quality standards to address pollution in its waterways. However, the impact of these policies on seafood safety and methylmercury exposure remains unknown. Here we developed a process-based model showing that, although mercury reductions from municipal wastewater policies accounted for only 9% of atmospheric mercury emissions during 1980–2022, these measures unexpectedly prevented ${\mathrm{102,000}}_{-\mathrm{6,600}}^{+\mathrm{11,000}}$ ${102,000}_{- 6,600}^{+ 11,000}$ mercury-related deaths and counteracted nearly two thirds of potential deaths from those emissions. Furthermore, these policies ensured that ${146}_{-9}^{+8}$ $146_{- 9}^{+ 8}$ megatonnes of freshwater seafood met the World Health Organization and China’s mercury-safety standards, preventing ${\mathrm{US}}\${498}_{-29}^{+32}$ $US $ 498_{- 29}^{+ 32}$ billion in economic losses. Finally, we explore how China, as the primary global seafood producer and exporter, could develop municipal wastewater policies at the regional level to reduce aquatic pollutants and unlock the health benefits of seafood consumption.