Kansai Airports

We have installed nine noise measuring stations in KIX, ten in ITAMI and four in KOBE, and are conducting 24-hour automatic measurements. The current noise levels measured at these stations are shown below.

• The noise level of each measuring station is displayed every two seconds. The unit is dB (A).
• The value that can be confirmed is the measured value (instantaneous values) from 3 minutes before to 30 days before and is different from the evaluated value (Lden). When an aircraft approaches, the station receives the transponder signal sent by the aircraft and the circle gets bigger.
• Because other nearby sounds may be measured when the transponder signal is received, not all noise values received by the transponder signal are aircraft noise.
• The display may be delayed or unavailable depending on the quality of your device or internet connection.

Aircraft noise level

Instantaneous value

• This is the measured instantaneous value at the noise measurement station installed by Kansai Airports.
• Displays the measured value every 2 seconds at each measurement station.
• Non-aircraft sounds are included.

Evaluation value (Lden)

• This is an evaluation value over a certain period of time based on the noise value measured at the noise measurement station installed by Kansai Airports.
• Since only aircraft noise is identified from the measured noise, no other sound is included.
• Energy is calculated and evaluated for each aircraft when the difference between the maximum noise level and the background noise level is 10 dB or more.

• Calculate the energy of each noise level for the number of occurrences.
• The same sound feels louder late at night and early in the morning, so weight it according to the time zone.
  (From 19:00 to 22:00: + 5 dB , From 22:00 to 7:00: + 10 dB)
• Calculate an evaluation value (Lden) by summing all the energy in a time period (one day unit).

Reference of noise level