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Atmospheric corrosion is in great part a by-product of environmental changes that have occurred throughout the industrial development of our land and resources. Many types of airborne particles and gases react with moisture and UV light to form new chemical compounds that can be transported as aerosols. A good example of this is the summertime haze seen in many large cities of our continent. Up to 50% of this haze is a combination of sulfuric and nitric acids. During various times of the year when lower temperatures, moisture, and UV light levels limit the formation of atmospheric acids, sulfates and nitrates plus other suspended particles and gases will collect on surfaces as dry deposition. Dry deposition removes from 60% to over 90% of all forms of contaminates in the atmosphere.
