The total daily bext for each day is converted to deciviews. This gives a future year daily

deciview value for each of the best and worst days.

Next, compute the arithmetic mean future deciview value for the “worst” and “best”

visibility days for each year. This leads to 5 future estimated mean deciview values for the

“worst” and 5 future estimated mean deciview values for the “best” visibility days. Compute the

arithmetic mean of the 5 mean values for deciviews on the “worst” days, and the arithmetic mean

of the 5 mean deciview values estimated for the “best” visibility days.

The resulting 5 year average mean values for deciviews on “worst” and “best” visibility

days can be compared to the baseline mean deciview values calculated in step 2. If the resulting

change in deciviews is a negative number (future - base), this represents an improvement in

visibility. Compare the change in visibility to the previously calculated uniform rate of progress

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