L10 is often used when assessing traffic noise and in planning applications: L10 is the level exceeded for 10% of the time and takes account of any annoying peaks in noise. L50 is the level exceeded for 50% of the time. It is statistically the mid-point of the noise readings.
How is noise level calculated?How to Make Noise Calculations with Decibels
Comparing Sound Power and Sound Pressure. ...
The dB Pressure Scale. ...
Comparing Two Pumps for Noise. ...
dB power = dB pressure + 20 log distance (feet) - 2.5 dB. ...
Solution: dB power = 87 + [20 × 0.954] - 2.5 = 103.58 dB. ...
dB pressure = dB power - 20 log distance (feet) + 2.5 dB. ...
According to Delany (1976), L10 can be calculated, primarily with the hourly traffic flow (q), speed (v), and % of heavy vehicles (p) by the following formula :