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low-level noise environment |
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An outdoor sound environment typical of a remote suburban setting, or a rural
or public lands setting. Characteristic average day-night sound levels (DNL,
represented by the symbol Ldn) would generally
be less than 45 dB, and the everyday sounds of nature, e.g., wind blowing in
trees and birds chirping would be a prominent contributor to the DNL. |
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Download IEC standards, International Electrotechnical Commission standards.
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