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The exposure map is also known as the DNL contour. DNL stands for day-night average sound level and is an average of daily noise exposure over an annualized period. DNL contours ultimately determine which areas and homes are eligible for MAC funded mitigation programs, including the sound mitigation program.
The cities touched by the 65 DNL noise contour each have a representative on the committee. These cities include Bloomington, Eagan, Mendota Heights, Minneapolis, and Richfield. The sixth community seat on the NOC is a shared at-large representative for other cities affected by airport noise including Apple Valley, Burnsville, Inver Grove Heights, St. Louis Park, St. Paul, and Sunfish Lake. After repeated requests to be given representation on the NOC, the NOC voted to grant Apple Valley status as an at-large community in March of 2006.