Steel is an imperative engineering material due to its endurance accounts for a significant part of the world economy. It has enormous demand all over the world for its extensive use in construction and other industries. These industries are experiencing inevitable atmospheric exposure and are rapidly deteriorating due to induced atmospheric corrosion. The study assessed and interpreted trends in atmospheric corrosion rates in India for the last 39 years, and spatially mapped seasonal decade-by-decade trends. North-east India has been identified as the most corrosive region in the country, with the rainy season being the most corrosive season. Corrosion maps for India are prepared on the basis of 39 years of atmospheric data. A corrosion zone map is prepared to classify the country into five different zones based on the rate of atmospheric corrosion. Long-term atmospheric corrosion rates are projected for the next 50 years in all major cities across the country. Long-term corrosion is estimated to reduce the rate of atmospheric corrosion by 81% after 10 years of exposure and 91% after 50 years of exposure.

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