Smoke/Particulate Matter. In all zoning districts, no use, activity, or process shall cause any emission of smoke or particulate matter that can cause any damage to human health, domestic/farm animals, vegetation, or other forms of property, or which can cause excessive soiling. No emission at any point from any chimney or otherwise visible gray smoke of a shade darker than No. One of the Ringelman Smoke Chart as published by the United States Bureau of Mines is permitted. Dust and other types of air pollution, borne by the wind from such sources such as storage areas, yards, roads, and driveways within lot boundaries, shall be kept to a minimum.