Page 1 Supporting Information High Resolution Atmospheric Modeling of Fluorotelomer Alcohols and Perfluorocarboxylic Acids in the North American Troposphere Greg Yarwood 1* , Susan Kemball-Cook 1 , Michael Keinath 2 , Robert L. Waterland 3 , Stephen H. Korzeniowski 3 , Robert C. Buck 3 , Mark H. Russell 3 , and Stephen T. Washburn 2 1 ENVIRON International Corporation, Golden Gate Plaza, 101 Rowland Way, Novato, CA 94945 2 ENVIRON International Corporation, 6001 Shellmound St., Suite 700, Emeryville, CA 94608 3 E. I. du Pont de Nemours and Company, Wilmington, DE 19805 *Corresponding Author E-mail: robert.l.waterland@usa.dupont.com Table of Contents Page CAMx Model 2 The role of NOx chemistry and model resolution in the simulation of FTOH 2 degradation 2 Simulation of FTOH degradation outside the CAMx domain 2 Emissions Inventory Methodology 3 Emissions estimates 3 Emissions calculations 4 Methodology used to calculate DuPont fluorotelomer emissions in NA 4 Figure S1: Geographic regions for emission apportionment 5 Table S1: Estimated annual air emissions of PFCAs and FTOHs … 6 Table S2: Comparison of model characteristics of IMPACT and CAMx 7 Table S3: Comparison of modeled and monitored atm conc of 8:2 FTOH 8 Table S4: Comparison of modeling results for atm conc of PFOA 9 Methodology used to calculate PFCA deposition from Scott et al 10 Detailed chemical mechanism 10 Table S5: Chem mechanism for OH-radical initiated chem degn of 8:2OH 11 Figure S2: Mechanism for gas-phase chem degn of 8:2 FTOH 15 Figure S3: Ann ave ground-level air conc of 8:2 FTOH in NA 16 Figure S4: Fractional yields of PFOA and PFNA from 8:2 FTOH 17