1. Spatial distribution of hourly trajectory endpoint frequencies top 10% of daytime RGM vs. total year with estimated 2002 emissions of reactive gaseous mercury 0.1 degree lat/long regional grid color of symbol denotes type of mercury source coal-fired power plants other fuel combustion waste incineration metallurgical manufacturing & other size/shape of symbol denotes amount of mercury emitted (kg/yr) 10 - 50 50 - 100 100 – 300 300 - 500 5 - 10 500 - 1000 1000 - 3500 Difference between selected case and total year in percent of back-trajectories passing through grid square > 2.5 2.0 to 2.5 1.5 to 2.0 Air Emissions Piney Measurement Site 1.0 to 1.5 0.5 – 1.0 0.0 – 0.5 < -2.5 -2.0 to -2.5 -1.5 to -2.0 -1.0 to -1.5 -0.5 to -1.0 0.0 to -0.5 Yellow /Orange grid squares: trajectories pass through more often than “average” Purple grid squares: trajectories pass through less often than “average”

2. Spatial distribution of hourly trajectory endpoint frequencies bottom 10% of daytime RGM vs. total year with estimated 2002 emissions of reactive gaseous mercury color of symbol denotes type of mercury source coal-fired power plants other fuel combustion waste incineration metallurgical manufacturing & other size/shape of symbol denotes amount of mercury emitted (kg/yr) 10 - 50 50 - 100 100 – 300 300 - 500 5 - 10 500 - 1000 1000 - 3500 Difference between selected case and total year in percent of back-trajectories passing through grid square > 2.5 2.0 to 2.5 1.5 to 2.0 Air Emissions Piney Measurement Site 1.0 to 1.5 0.5 – 1.0 0.0 – 0.5 < -2.5 -2.0 to -2.5 -1.5 to -2.0 -1.0 to -1.5 -0.5 to -1.0 0.0 to -0.5 0.1 degree lat/long regional grid Yellow /Orange grid squares: trajectories pass through more often than “average” Purple grid squares: trajectories pass through less often than “average”

3. Spatial distribution of hourly trajectory endpoint frequencies top 10% of Hg(p) vs. total year with estimated 2002 emissions of particulate mercury color of symbol denotes type of mercury source coal-fired power plants other fuel combustion waste incineration metallurgical manufacturing & other size/shape of symbol denotes amount of mercury emitted (kg/yr) 10 - 50 50 - 100 100 – 300 300 - 500 5 - 10 500 - 1000 1000 - 3500 Difference between selected case and total year in percent of back-trajectories passing through grid square > 2.5 2.0 to 2.5 1.5 to 2.0 Air Emissions Piney Measurement Site 1.0 to 1.5 0.5 – 1.0 0.0 – 0.5 < -2.5 -2.0 to -2.5 -1.5 to -2.0 -1.0 to -1.5 -0.5 to -1.0 0.0 to -0.5 0.1 degree lat/long regional grid Yellow /Orange grid squares: trajectories pass through more often than “average” Purple grid squares: trajectories pass through less often than “average”

4. Spatial distribution of hourly trajectory endpoint frequencies bottom 10% of Hg(p) vs. total year with estimated 2002 emissions of particulate mercury color of symbol denotes type of mercury source coal-fired power plants other fuel combustion waste incineration metallurgical manufacturing & other size/shape of symbol denotes amount of mercury emitted (kg/yr) 10 - 50 50 - 100 100 – 300 300 - 500 5 - 10 500 - 1000 1000 - 3500 Difference between selected case and total year in percent of back-trajectories passing through grid square > 2.5 2.0 to 2.5 1.5 to 2.0 Air Emissions Piney Measurement Site 1.0 to 1.5 0.5 – 1.0 0.0 – 0.5 < -2.5 -2.0 to -2.5 -1.5 to -2.0 -1.0 to -1.5 -0.5 to -1.0 0.0 to -0.5 0.1 degree lat/long regional grid Yellow /Orange grid squares: trajectories pass through more often than “average” Purple grid squares: trajectories pass through less often than “average”