We have not posted as much on turbine noise, as it will have an effect primarily on the wildlife, and anyone in the the area, hiking, or hunting.
The sales pitch newer industrial turbines are only as loud as a refrigerator. What they do not add is that it sounds like a refrigerator when you are standing 400 meters (1312 feet) away from the turbine.
One thing to understand is how decibels numbers work.
100 dB is 8 times as loud as 70 dB.
80 dB is 2 times as loud as 70 dB.
60 dB is half as loud as 70 dB
50 dB is One-fourth as loud as 70 dB.
The graphic compares sound levels at various distances from a wind turbine to the sound levels of familiar appliances. (If you are standing right next to the appliance).
For example, at 100m (109.3 yards, 328 feet ) the sound level from a wind turbine is stated to be 50 dB about the same as a nearby air conditioner.
500 meters = 546 yards, or 4.5 football fields
Vacuuming – 75 dB
Gas lawnmower or snowblower – 106 dB
Chainsaw – 110 -120 dB
Jet plane takeoff – 120-140 dB
One thing to note- air quality, height, obstacles terrain, water, all can make a difference in this- and this chart does not look like it takes any of that into account. Nor does it take into account what the combined sound from multiple turbines is. (consider 1 person talking vs 50 people talking)
The sound of a wind turbine. Stereo recording made with wind force 7bft. The montage contains several takes, each one miked closer to the turbine which gives insounds. Recording was made near the Oosterschelde, Zeeland. lying in a ditch to hide from the wind. Turbine: Vestas V90