Decreasing extinction (in units of inverse distance) can in turn be used to estimate quantitative measures more directly related to human perception such as contrast of distant targets and visual range.
Decreasing extinction cannot be used to make estimates. 
mnli hypothesis: Decreasing extinction cannot be used to make estimates.  premise: Decreasing extinction (in units of inverse distance) can in turn be used to estimate quantitative measures more directly related to human perception such as contrast of distant targets and visual range.