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Community Noise Criteria I <br /> Leq <br /> Equivalent continuous sound level. The steady dB(A) level which <br /> would produce the same A-weighted sound energy over a stated period <br /> of time as a specified time-varying sound. <br /> Ldn <br /> A 24-hour Leq, except 10 dB is added to all levels measured between <br /> 2200 and 0700 hrs. II <br /> Ln <br /> The dB(A) level exceeded N% of the time. e,g, L90, the dB(A) level II <br /> exceeded 90% of the time, is commonly used to estimate ambient <br /> noise level. <br /> Lsel I' <br /> Single Event Noise Exposure Level. The dB(A) level which, if it <br /> lasted for one second, would produce the same A-weighted sound <br /> energy as the actual event. II <br /> li <br /> II <br /> II <br /> 11 <br /> II <br /> II <br /> II <br /> I <br />