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Congress often passes expansive legislation, frequently environmental and public health regulatory statutes, where both the definition of those items being regulated and the mandate have significant breadth. How should these provisions be construed? While it is difficult to establish a model which determines whether to broadly or narrowly construe an expansive statutory provision, factors that impact this choice include the existence of express limitations on the mandate, understandings of congressional intent, the need to avoid regulation that might do more harm than good, the nature of the regulated item, and intervening circumstances such as new understandings in law, policy, or science. This Article sets out to establish how, why, and when courts should broadly interpret expansive environmental and public health legislation. Absent express limitations requiring cost-benefit analysis or technological feasibility, courts should broadly construe expansive environmental legislation. Why? Courts are equipped to interpret the textual mandate, the costs of a failure to regulate, even in an interim period, are potentially great, and Congress, in recognition of changed circumstances, was aware of the breadth of the textual language; whereas courts should allow administrative agencies to narrowly or broadly construe statutory provisions with such limitations subject to Chevron deference.