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. 2015 Oct 19;112(44):13514–13519. doi: 10.1073/pnas.1510743112

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Fig. 2. — Model-predicted gas phase H₂SO₄ and MSA concentrations (ppb) in the SoCAB at 8:00 h, 12:00 h, 16:00 h, and 20:00 h. (A) H₂SO₄ concentrations (ppb) with SO₂ and H₂SO₄ emissions representative of 2011–2013. (B) H₂SO₄ concentrations (ppb) with sulfur fossil fuel emissions, boundary conditions, and initial conditions for SO₂ and H₂SO₄ set to zero. (C) MSA concentrations (ppb) with sulfur fossil fuel emissions, boundary conditions, and initial conditions for SO₂ and H₂SO₄ set to zero. The domain-wide average gas phase MSA concentration is not significantly sensitive to the scenario chosen for sulfur fossil fuel emissions.