Shenandoah National Park, Virginia

Skyland Location – WNW Vista (1991 – 1995)

1500 Slide Spectrum Series

Cumulative Frequency Summary

Spectrum Sequence #	Representative Visibility Condition Summary			Representative Cumulative Frequency of Reconstructed Extinction IMPROVE Aerosol Data (1988 - 1998)
	dv	bext (Mm^-1)	VR (km)
1 of 12	4	14	275	< 1%
2 of 12	8	22	180	1%
3 of 12	9	24	160	1%
4 of 12	11	30	130	2%
5 of 12	12	33	120	3%
6 of 12	14	39	100	5%
7 of 12	16	49	80	10%
8 of 12	18	60	65	20%
9 of 12	21	78	50	40%
10 of 12	28	156	25	75%
11 of 12	30	196	20	85%
12 of 12	33	261	15	95%

Prepared by Air Resource Specialists, Inc.

for the IMPROVE Program

1999