CRGAQS Latest CAMx 2018 Results Presentation to the

CRGAQS: Latest CAMx 2018 Results Presentation to the Gorge Study Technical Team ENVIRON International Corporation Alpine Geophysics, LLC May 23, 2007 V: corporatemarketingoverview. ppt

Today’s Presentation • Review 2004 extinction against IMROVE • Review modeled organic carbon • components Show revised nephelometer comparisons – Account for high humidity in November episode • Latest 2018 CAMx simulations – Review results for August episode • Compare 2004, 2018 and 2018 What-if’s – Review results for November episode • Compare 2004, 2018 and 2018 What-if’s – Trend lines • Next Steps V: corporatemarketingoverview. ppt

2004 Extinction vs IMPROVE V: corporatemarketingoverview. ppt

2004 Extinction vs IMPROVE V: corporatemarketingoverview. ppt

CAMx Organics • Primary organic aerosol (POA) – Sources: any combustion – Emitted as a stable aerosol • No evaporation/re-condensation • Secondary organic aerosol (SOA) – VOCs oxidize to condensable gases – SOA forms as f(T, RH, aerosol mass) – Condensation/evaporation possible V: corporatemarketingoverview. ppt

CAMx Organics • CAMx treats 5 kinds of SOA – SOA 1 -3 from anthropogenic VOC sources • Tracks formation from aromatics and parafins • Combustion and fugitive sources – SOA 4 -5 from biogenic VOC • Terpenes generate two SOA products • Less apt to evaporate • Updates coming for both CAMx and CMAQ – Sesqueterpenes and isoprene V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (August) V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (August) V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (November) V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (November) V: corporatemarketingoverview. ppt

November Nephelometer V: corporatemarketingoverview. ppt

November Nephelometer V: corporatemarketingoverview. ppt

What-if Scenarios • Case 01 – zero Boardman emissions • Case 02 – zero NH 3 emissions for PSAT • • • V: corporatemarketingoverview. ppt region 5 (east of Gorge) Case 03 – zero on-road mobile source emissions for PSAT region 2 (Portland Vancouver) Case 04 – zero major point source emissions for PSAT region 2 Case 05 – zero major point source emissions for PSAT region 1 (in-Gorge)

PSAT Regions V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (August) V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (August) V: corporatemarketingoverview. ppt

Calculation of Trend Lines • 2004 to 2018 trend in extinction – Average daily extinction over “high” days • August Episode – August 10 -15 at Mt Zion – August 12 -15, 19 at Wishram • November Episode – November 6, 8, 9, 13, 16 at Zion – November 8, 10 -14 at Wishram – Calculate “Deciview” from extinction • Linearizes extinction effect on visual range • DV change of ~1 is “just perceptible” change in visibility V: corporatemarketingoverview. ppt

August Trend Lines -0. 03 per year -0. 44 Mm-1 per year -0. 44 -6. 2 Mm-1 -10% -1. 35 -0. 99 Mm-1 per year -13. 9 Mm-1 -27% V: corporatemarketingoverview. ppt -0. 10 per year

2004 vs. 2018 Results (November) V: corporatemarketingoverview. ppt

2004 vs. 2018 Results (November) V: corporatemarketingoverview. ppt

November Trend Lines -0. 03 per year -2. 42 Mm-1 per year -3. 67 Mm-1 per year -33. 9 Mm-1 -9% -51. 4 Mm-1 -15% V: corporatemarketingoverview. ppt -0. 05 per year -0. 42 -0. 72

Next Steps • Apply modeled changes to observed • • V: corporatemarketingoverview. ppt levels Finish PSAT (2004/2018, August/ November) Complete report