However, it does extend that district into some lots where residential development was permitted-and where homes already exist. The county currently recognizes three gradations of airport noise: the 65-decibel LDN, where residential development is prohibited the 60 LDN and a one-mile buffer around the 65 LDN.Ī new noise study conducted in 2019 yielded a slight reduction in actual and projected noise contours, reaching further north of the airport but less far to the west, for a net reduction of 39 acres in the highest-impact area, with a total of 476 acres inside the 65 LDN.
Noise maps are based on a calculation called the Day-Night Average Sound Level, abbreviated in county zoning as LDN, which measures the average level of sound over a 24-hour period, with a penalty for noise at night.
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