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. 2015 May 1;123(11):1173–1179. doi: 10.1289/ehp.1408988

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Effect of concentrated ambient particle (CAP) exposure on plasma endothelin-1 levels. Blood was collected before and immediately after exposure (post) to filtered air and CAP, and again the next morning (follow-up) and assayed for endothelin-1 by ELISA as described in “Methods.” Symbols represent differences between CAP and filtered-air exposure, expressed as average percent point differences per 100-μg/m3 increase in CAP, relative to the baseline; bars indicate 95% CIs.