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A-weighted sound pressure level versus time t (T = 1 h) for an urban local road. The sound pressure levels (SPLs) above the threshold K are events contributing to determine Leq,T,Events. For the plotted hourly SPL time history intermittency ratio (IR) = 93.3%, LAeq,T,tot = 59.8 dB(A), number of events above K threshold = 45 and LAeq,T,Events = 59.5 dB(A).
