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Opportunity costs of environmental regulations (OCER) are an important consideration when governments make decisions on the formulation of environmental policies and when plants make decisions in response to environmental policies. Aimed at measuring OCER, the current paper proposes an approach in which the achievements of environmental control implemented by a production unit are considered. We quantify and define the achievements as "desirable" environmental outputs. In this way, for a production unit, producing normal desirable outputs and reaching environmental outputs is a tradeoff. OCER is measured by calculating a maximum amount of increasable normal outputs when production units do not need to produce any environmental outputs. Directional distance functions and data envelopment analysis (DEA) techniques are used to calculate OCER. The approach is applied to an empirical illustration based on Taiwan's port industry covering the period 2001–2007. It is found that the industry incurred opportunity costs due to environmental regulations equivalent to 1.8% of total revenue it creates. However, the OCER are significantly less than the economic losses due to productive inefficiency (PIE).