本研究以臺灣揮發性有機化合物（Volatile Organic Compounds， VOCs）管制政策為核心，探討政府在逐步強化空氣污染防制法規後，其制度介入如何影響微觀企業之經營績效與產業結構。本研究將 2018 年政府全面強化 VOCs 管制視為具有明確時間標記的政策干擾事件，整合台灣經濟新報（TEJ）財務追蹤資料庫，篩選出 40 家有效上市櫃大廠、共計 530 筆公司—年度之追蹤資料觀察值（2008–2022 年）。實證方法採行標準之雙重差分法（Difference-in-Differences， DID），在控制公司個體固定效果、年度固定效果之雙重固定效果（TWFE）模型下，精確評估環境治理政策對企業資產報酬率（roa）、股東權益報酬率（roe）與營業利益率（opm）之淨政策衝擊。 實證計量結果顯示，雙重差分核心交互項（DID）對主要獲利指標之估計係數均呈現正向但不顯著之特徵，宣告了 2018 年空污法加嚴政策具備微觀財務上的「法規中立性」，充分證實臺灣公開發行傳產大廠具備強大的營運韌性。然而，橫斷面規模異質性分析揭示了高度的「資本非對稱特徵」：在大型企業子樣本中，DID 交互項對本業營業利益率（opm）表現出高達 +4.6533 且通過 5% 檢定的顯著正向拉動力。此一核心證據排他性地支持了環境經濟學中的「強式波特假說」，顯示高昂的環境合規壁壘在產業內部引發了非自願性的市場洗牌，迫使缺乏合規能力之地下邊緣工廠加速退場，進而使留存的合規龍頭大廠斬獲了市場份額重組之「轉單紅利」。本研究之貢獻在於將環境政策量化為因果識別事件，補足了微觀個體層面之實證缺口，為未來政策制定者推動綠色轉型與差異化分流配套提供了兼具計量穩健性與制度背景的決策依據。;This study investigates how Taiwan’s regulatory enforcement on Volatile Organic Compounds (VOCs) reshapes the operational performance and structural configuration of manufacturing enterprises. Conceptualizing the landmark 2018 amendments to the Air Pollution Control Act as a quasi-natural experiment， we utilize a high-dimensional panel dataset from the Taiwan Economic Journal (TEJ) database， spanning 2008 to 2022 and comprising 40 listed firms with 530 firm-year observations. We construct a rigorous Two-way Fixed Effects Difference-in-Differences (DID) model to identify the net causal effect of environmental governance on corporate profitability (roa， roe) and operational efficiency (opm). The empirical results indicate that the coefficients of the DID interaction term across all primary indicators are positive but statistically insignificant， robustly demonstrating "Regulatory Neutrality" and reflecting the strong operational resilience of listed firms. However， cross-sectional heterogeneity analysis reveals a severe capital asymmetry: in the large-scale enterprise sub-sample， the DID term exerts a significantly positive effect (+4.6533; p = 0.010) on the operating profit margin (opm). This core finding exclusively supports the "Strong Porter Hypothesis，" suggesting that stringent environmental enforcement triggers a structural market reshuffle， forcing non-compliant marginal factories to exit while allocating market share reconfigurations and "order-reallocation dividends" to compliant industry leaders. This study contributes to the literature by providing robust micro-firm evidence for targeted green transition policies.
