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. 2007 Jan 22;115(5):743–750. doi: 10.1289/ehp.9712

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Sensitivity of efficiency–equality tradeoff conclusions to pollutants included in the model, with model otherwise specified as in Figure 2. Pollutants included in the model: (A) primary PM only; (B) NO_x only; (C) SO₂ only; and (D) SO₂ and NO_x only.