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. 2015 Apr 3;120(7):2990–3005. doi: 10.1002/2014JD022378

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©2015. The Authors.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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(a) Mass spectra of an ambient particle containing GA sulfate signal, (b) a laboratory particle generated from GA sulfate standard, and (c) a particle generated from a mixed solution of glycolic acid, NH₄HSO₄, and H₂SO₄.