Grand Canyon National Park, Arizona

1500 Slide Spectrum Series (1983 - 1996)

Cumulative Frequency Summary

Spectrum Sequence #	Representative Visibility Condition Summary			Representative Cumulative Frequency of Reconstructed Extinction IMPROVE Aerosol Data (1988 - 1997)
	dv	bext (Mm^-1)	VR (km)
1 of 8	0	10	380	< 1%
2 of 8	2	12	320	< 1%
3 of 8	3	14	280	1%
4 of 8	5	16	240	3%
5 of 8	7	21	190	20%
6 of 8	9	24	160	30%
7 of 8	10	28	140	50%
8 of 8	13	36	110	80%

Prepared by Air Resource Specialists, Inc.

for the IMPROVE Program

1998