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by mischa_u 2284 days ago
As for doing fit testing at home, using cigarette smoke might be helpful:

"... it was found that tobacco smoke as it comes from a cigarette is an extremely concentrated aerosol with a relatively stable distribution of sizes ranging from 0.1 to 1.0 micron, peaked between 0.2 and 0.25 micron."

Source: https://www.sciencedirect.com/science/article/pii/0095852260...