Sleep disturbance, anxiety, depression, hearing loss, contamination of soil, air and water causing various health ailments; these are factors that officials should consider before issuing Conditional Use Variances and special permits that allow industrial operations in or adjacent to residential areas. Aside from the obvious raucous industrial noise-making operations that are pretty much universally considered in violation of residential zoning (although not enforced in Habersham County) my research has revealed that there are sound frequencies produced by machines that are not even really audible but produce vibrations that disturb your sleep, cause loss of hearing, anxiety, stress, fatigue and even panic attacks. Infrasound is especially detrimental because it generally cannot be heard by the human ear but it can cause serious physical problems, even death if intense enough.