The sound level near a noisy air conditioner is 70 dB. If two such units operate side by side, the sound level near them would be

A single air conditioner corresponds to an intensity of 70 dB. An additional air conditioning unit would correspondingly double the intensity of the sound. However, it does not double the decibels to 140 dB. Instead, only 3 dB is added to the 70 dB, which makes the total decibels of two air conditioning unit equal to 73 dB.