Figure 1 shows that ambient noise levels can exceed the wind turbine noise. In this figure most data were from nighttime, when AUC (2013) predicted noise levels were 40dB A-weighted. In the 4kHz band alone, the ambient noise in Fig. 1 was over 40 dB. As noted in Sec. IIIA, this is likely due to vegetation noise from trees and crops, which were common in the CNHS areas