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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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Average vertical profiles of measured (a) IEPOX sulfate (red) and GA sulfate (black) in aerosol mass (%), (b) isoprene (green), gas phase IEPOX (blue), (c) and PALMS acidity signal (orange), and (d) estimated pH (purple) in the eastern (solid) and western (dashed) U.S. during DC3 and (e–h) SEAC4RS. Longitude 96°W is used to separate eastern U.S. data from western U.S. data. The error bars in the estimated pH panels represent ±1 standard deviation of the 5 min average data. The data points in each bin for eastern and western U.S. are on the right and left of the error bars, respectively.