Frequency-based aircraft noise charts (N70s)
For the community, it is important to know how many times a particular noise level will be exceeded in an area. For this reason, frequency-based measures of aircraft noise are used. Typically, contour maps showing the number of events louder than 70 dB(A) are used. These are known as N70 contours.
The N70 level is chosen because it is equivalent to the single event level of 60 dB(A) specified in Australian Standard AS2021-2015 as the indoor design sound level for normal domestic areas in dwellings. An external single noise event will be attenuated by approximately 10 dB(A) by the fabric of a house with open windows. This is the sound pressure level of a noise event that is likely to interfere with conversation or with listening to radio or television.
This interactive tool displays the forecast N70 chart for Sydney Airport in 2039. Hover over the different contour levels to see how many events greater than 70dB you could expect at that location.
Your location will display on the map based on your location input. Enter your address to see information relevant to where you live or your suburb to see information general to your suburb. If you choose not to enter your location, you will see information for Sydney CBD.
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