Breathing dust from hardi backer board for tile floors?

We are installing tile floors ourselves and my husband has been a bit careless with the dust from the hardi backer. He has cut the stuff without wearing a mask. He has laid it in the living room and foyer and the tile won’t be here for probably 2 weeks. How bad is this? Does it take a lot of exposure to get silicosis or only a little. My son and I both have sore throats but people in this area are getting fall allergies . In our case we can’t tell if it’s that or these dusty boards.

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