Particulate contamination. Solid particles deposited on the metal result in the presence of galvanic cells, they damage soft protective coatings, especially oil coatings. These molecules, and above all, soot and coal coke breeze have a large "charge" absorbed” aggressive gases, e.g. sulfur dioxide and hydrogen sulfide, which they release to the surface of the metal during the process of leaching by water. This process occurs at the moment, when they are wetted by condensation. A drop of an aggressive solution is then formed, mostly acidic, causing immediate point corrosion of the metal. If solid salt particles are deposited on metal products, there is often a form of corrosion called filiform corrosion due to its specific form. Contamination with solid particles is a serious and often underestimated source that intensifies the corrosion process of products during storage and transport.. It needs to be highlighted that, that the risk of dusting in our country is very high and its presence and influence on corrosion of metals must be taken into account in the practice of storage. Then, settling of drops of aggressive liquids on the metal products occurs, when they are stored in industrial or coastal areas, be transported by rail or ship. Fog, steam coming out of the boilers, leaky central steam heating. digestive branches, hardening plants and electroplating plants deposit on the metal surface causing pitting in a very short time.