ISO 8536-4 Contamination Index

#1
I've got a question regarding the N<90 particulate contamination index in ISO 8536-4. Is there more information regarding where the N<90 came from (especially the parts about how you multiply 25-50 um particle counts by 0.1, 50-100 by 0.2, and 100+ by 5, etc.) I'm trying to figure out why it is N<90 as this seems rather arbitrary without much backing to my understanding.
 
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