There are basically two ways to know the environmental corrosivity in an electrical room, and classify it according to the standard ISA – S71.04

Corrosion monitors

Devices able to determine real-time corrosivity on copper and silver sensors, providing a real-time and average corrosion category.

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Corrosion coupons

Very reliable, they have sheets of copper and silver normally (also gold). Need to stay 30 days exposed. The analysis is subsequently made by the laboratory, and the results are provided in a report.