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Our basic defenses such as nasal hairs and mucus help in trapping the dust particles and other Suspended Particulate Matters (such as smoke etc). However, if there is too much of dust inhalation then, as you suspect, it will be harmful. This can be seen in quarry workers who inhale a lot of dust- which causes silicosis. Dust also instigates asthma. You ...

You asked the single most difficult questions ever, so be proud of yourself! I've spent some time in the lab with a post doctorate trying to answer that particular question. It all is based on something called the hygiene hypothesis: the belief that as we are getting cleaner we are seeing less and less bacteria and so our immune system isn't working as it ...