Estimate of Current Pollutant Concentrations and Deposition in
Class I Wildernesses of the Pacific Northwest*
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Ozonea Annual Deposition Rangesb Ion Concentrationsc
Wilderness Mean Max Sulfur Nitrogen Rain + Snow Cloud Water
(S) (N) S N pH S N pH
Alpine Lakes 25-30 120+ 2.0-3.6 1.8-2.6 0.5 0.3 5.3 6.8 5.2 3.9
Diamond Peakd 25-30 60-80 .7-2.0 .5-1.1 .3 0.2 5.6
Eagle capd 30-35 40-60 .3-.8 .4-.8 .2 0.2 5.5
Gearhartd 25-30 60-80 .3-.5 .3-.5 .2 .3 5.8
Glacier Peak 25-30 60-80 2.1-4.0 1.8-2.9 .4 .3 5.2 1.8 1.6 4.4
Goat Rocks 25-30 80-100 4.0-5.9 3.8-4.5 .5 .2 5.3 4.8 6.1 3.8
Hells Canyond 30-35 40-60 .3-.7 .3-.6 .2 .2 5.5
Kalmiopsisd 20-25 60-80 1.8-3.3 .4-.9 .4 .1 5.6
Mount Adams 25-30 80-100 4.0-5.4 4.1-4.5 .5 .2 5.3 4.8 6.1 3.8
Mount Hoodd 30-35 >120 1.5-4.3 1.1-2.7 .4 .3 5.4
Mt Jeffersond 25-30 60-80 1.2-2.0 .5-.9 .3 .1 5.5
Mt Wash.d 25-30 60-80 1.3-2.5 .5-1.3 .3 .1 5.5
Mtn Lakesd 25-30 60-80 .8-1.3 .5-.9 .3 .2 5.6
Pasayten 25-30 60-80 2.0-3.6 1.8-2.6 .4 .3 5.5
Strawberry Mtnd 30-35 40-60 .3-.7 .3-.6 .2 .2 5.5
Three Sisitersd 25-30 60-80 .7-2.8 .3-1.8 .3 .1 5.5

Data are from:
Peterson, Janice, Et al. 1992. Guidelines for Evaluating Air Pollution Impacts on Class I Wilderness Areas in the Pacific Northwest.

a Hourly mean and maximum for May through October.
b Sulfur deposition is SO42-, based on volume weighted average for the sum of rain+snow deposition and cloudwater deposition. Nitrogen deposition is based on the volume weighted average for NO3- and NH4+ for the sum of rain+snow deposition and cloudwater deposition.
c Sulfur concentration is the median value SO42- concentration. Nitrogen concentration is the median value for the sum of NO3- and NH4+ concentration.
d Application data on cloudwater chemistry are not available. Deposition and ion concentration therefore are based on data for rain+snow only; these estimates are probably much lower than actual.