|40||Quiet residential area or a semi-rural location|
|42||* Airplane Transitions above 20,000 feet.|
|45-60||* Airplane Arrivals between 7,000 and 14,000 feet.|
|60-70||* Airplane Arrivals below 7,000 feet.|
|70||Road & Street traffic|
|140||* Airplane taking off|
A difference of 10 decibels is a doubling of loudness.
A difference of 3 decibels is a doubling of sound Intensity.
Baseline – World Health Organisation of 45 dB.