What's the concentration level of corrosive airborne contaminants in a data center

The concentration level of corrosive airborne contaminants in a data center shall meet the requirements listed in the white paper entitled Gaseous and Particulate Contamination Guidelines for Data Centers published in 2011 by American Society of Heating Refrigerating and Air-conditioning Engineers (ASHRAE) Technical Committee (TC) 9.9.

According to the Guidelines, corrosive airborne contaminants in a data center shall meet the following requirements:
Copper corrosion rate
Less than 300 ?/month per ANSI/ISA-71.04-2013 severity level G1.

Silver corrosion rate
Less than 200 ?/month.

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