10 At a location near an airport there are N_A aircraft flyovers per hour and N_V vehicle drivebys per hour. When an aircraft flies over, the A-weighted sound pressure level increases from the ambient level of 55 dB(A) to 8383 dB(A). The flyover duration is 1212 seconds. When a vehicle drives by, the A-weighted sound pressure level is increased from the ambient level of 55 dB(A) to 8080 dB(A). The driveby duration is 33 seconds.

What is the maximum noise level when a single flyover and a single driveby overlap?

L_A = dB(A)

For a given hour, there are 10 aircraft flyovers and 50 vehicle drivebys. What is the equivalent continuous A-weighted sound pressure level for that hour?

L_Aeq,1h= dB(A)