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These maps
display the number of miles one can see on the average summer
day. The darkest shading represents the worst visibility with
less than 7 miles while the lightest shade corresponds to greater
than 30 miles visibility.
The maps
display average visibility during June, July, and August, typically
the worst season of the year, over a five-year period. The most
recent time period for which these airport measurements are available,
1990 to 1995) is compared to a similar time span ten years earlier.
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