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• <br /> NOISE TERMINOLOGY <br /> dB Dedibel, a unit for measuring noise <br /> Lmax Maximum noise level of a noise event <br /> • <br /> SEL Single Event Noise Level, the total noise of an event <br /> Dur Duration of a noise event in seconds <br /> • <br /> Leq Average sound level of a noise event <br /> • <br /> Hourly Aleq Average hourly sound level due to aircraft noise <br /> • Beacon Aircraft identification number (1200 is often a helicopter) <br /> A/C Aircraft, type of <br /> R/W Runway <br /> A/D Type of operation: arrival, departure or overflight by a non -OAK flight <br /> • <br /> CNEL Community Noise Equivalent Level. This is the term used by the.State of <br /> California to define the average noise level for a given period of time. The <br /> • time period has to be at least 24 hours. It is calculated by averaging all . <br /> aircraft noise during the time period with penalties added for noise <br /> • occurring between 7 p.m. -7 a.m. <br /> • <br /> • <br /> • <br /> • <br /> • <br /> • <br />