Due to the fact that the possibilities of air contamination cannot reasonably be comprehensively covered in this Section, there shall be applied the general rule that there shall not be discharged from any sources whatsoever such quantities of air contaminants or other materials in such quantity as to cause injury, detriment, nuisance or annoyance to any considerable number of persons or to the public in general or to endanger the comfort, repose, health or safety of any such considerable number of persons or to the public in general or to cause or have a natural tendency to cause injury or damage to business, vegetation or property.