1. 1 Gorge EI Analysis Presented to the Gorge Study Technical Team By Christopher Swab Air Quality Division, Technical Services June 20, 2007

2. 2 Gorge EI Data: 2004 and 2018 Episodes  Domain-wide analysis * Point source SOx breakdown * NOx  PSAT Realm EI analysis (SMOKE reports) * Different day than domain-wide * Area * Nonroad * Natural Sources (biogenic + geogenic) * Industrial point sources * On-road not included in this presentation - 2004 on-road EI data not provided  Source type is EPA convention: SCC * Area source type includes wildfires

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4. 4 Primary Metal Production: Aluminum Ore ------------ SO2, Tons Per Day ------------ Aug-04Aug-18Nov-04Nov-18 Washington: Chelan Co.0.0214.30.0214.0 Washington: Clark Co.010.8010.5 Washington: Klickitat Co.02.00 All Other Domain Counties0000 Pulp and Paper and Wood Products ------------ SO2, Tons Per Day ------------ Aug-04Aug-18Nov-04Nov-18 Washington: Walla Walla County1.510.61.510.6 Oregon: Clatsop County1.54.61.54.6 Oregon: Columbia County1.84.41.74.4 All Other Domain Counties3.06.13.06.1

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6. 6 PSAT Realms

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11. 11 Secondary Metal Production: Aluminum-Fluxing: Chlorination: Chlorine Demagging – Wasco County, Oregon Aug-04=0 Aug-18=44.2 Nov-04=0 Nov-18=41.2 All Other Industrial Point Source Emissions Estimates Aug-04=0.1 Aug-18=0.1 Nov-04=0.1 Nov-18=0.1 PSAT Realm 1: Industrial Point Sources PM25, tons per day