MANE-VU states, Virginia and West Virginia Regional Haze Trend Analyses Latest available (December 2011) 2000-2010 IMPROVE DATA (for TSC 5/22/2012) Tom.

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MANE-VU states, Virginia and West Virginia Regional Haze Trend Analyses Latest available (December 2011) IMPROVE DATA (for TSC 5/22/2012) Tom Downs, CCM Chief Meteorologist Maine DEP-BAQ

20% Best and 20% Worst Visibility Day Deciview Trends RH data available on the IMPROVE ( and VIEWS ( websites. Data used in the plots for this presentation is the most recent (December 2011) QA’d data using the new revised IMPROVE algorithm The following set of plots compare monitored deciview values for the 20% best and worst visibility days with natural background, the Uniform “glide path” to natural conditions for the 20% worst visibility days and the CMAQ modeled 20% worst and best days “glide paths” from the baseline period to 2018.

As states near the mid course review, are deciview levels showing reasonable progress? For the 20% best visibility days all sites are trending below their “glide path” and many sites are currently significantly below their respective Uniform and CMAQ 2018 “glide path” levels Visibility during the 20% best visibility days are not degrading

Light Extinction Contribution Trends The following set of slides show the relative contributions to light extinction for the 20% best and 20% worst visibility days due to the following particles in the atmosphere: –Ammonium sulfate –Ammonium nitrate –Organic mass –Light absorbing carbon –Fine Soil –Sea Salt –Coarse Mass (PM10) –Total particle (PM2.5 and PM10) –Rayleigh scattering

Percent Contribution to Light Extinction

20% Worst Visibility Days Current ( ) contribution to light extinction due to sulfates continues to dominate (55-78%) at all sites with the highest contribution at sites in Virginia and West Virginia. (note this is down from 60-82% during the baseline period) Contribution to light extinction organic mass is the second highest at most sites (nitrates at Brigantine) and is not much higher than due to Rayleigh scattering. Contribution to light extinction from all other particle pollutants is the same or lower than due to Rayleigh scattering at all sites.

20% Best Visibility Days Contribution to light extinction due to Rayleigh scattering (56-68%) dominates at all northern sites with sulfates contribution second at 18-24% with organic mass third at 4-9%. Contribution to light extinction due to sulfates (31-40%) and due to Rayleigh scattering (29- 37%) dominate at all southern sites sites with organic mass third at 7-11%.