I wondered about this as well : https://www.researchgate.net/profile/Michael_Schappert/publication/224237295_Corrosion_management_for_data_centers/links/5514167

I wondered about this as well : https://www.researchgate.net/profile/Michael_Schappert/publication/224237295_Corrosion_management_for_data_centers/links/551416740cf2eda0df303ffb.pdf https://www.researchgate.net/profile/Michael_Schappert/publi... Seems like its a combination of cooling data centres (flowing air) and the quality of the air being circulated. So if there are pollutants in the air they pose a danger to the circuitry. Never occurred to me this was yet another thing to be wary of when running a data centre!