96 



FIGURE LEGENDS 



Figure 1 . Location of the Shenandoah Park and surrounding airports recording hourly 

 visibility data. 



Figure 2. Mean noon visibility trends for each month for the surrounding airports. 



Figure 3. "Typical" transmissometer data for the Grand Canyon, Summer, 1991. 



Figure 4. The entire record of summer transmissometer for Shenandoah Park, published 

 by Air Resource Specialists. 



Figure 5. Median haziness for each summer in theShenandoah Park (see text). 



RFEFERENCES 



Air Resource Specialists, 1993. National Park Service Visibility Monitoring and Data • 

 Analysis Program: Summary of Revi sed Transmissometer-Based Visiblitv Data. U.S. 

 Dept of the Interior, National Park Service, Air Quality Division, 593pp. 



Davis, R.E., 1991. Atmospheric Environment 25B, 165-175. 



Sloan, C. S., 1983. Atmospheric Environment 17, 763-744. 



Stenger, P. J., and P. J. Michaels, Proceedings, 6th Conference on Applied Climatology, 

 American Meteorological Society, Charleston, SC, 80-83. 



, 1992. Theoretical and Applied Climatology, 45, 167-175. 



