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TOLEDO, Ohio — For the ... on something called the Bortle Scale. A ranking of 1 is true darkness, while 9 is the highest and brightest. Per a light pollution map, downtown Toledo is an 8 ...
Light pollution is measured on something called the Bortle Scale. A ranking of 1 is true darkness, while 9 is the highest and brightest. Per a light pollution map, downtown Toledo is an 8 ...
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