Discussion
House dust mites are a significant indoor allergen source and their populations are controlled chiefly by
Answer: C
Correct answer: Relative humidity
House dust mites have no means of drinking; they absorb water vapour directly from the air through their cuticle. Below about 50 per cent relative humidity they cannot maintain their water balance and the population collapses.
That makes humidity the practical control, and it is why mite allergen is a lesser problem in dry climates and at altitude. Temperature matters only within the range that already suits them, and light and carbon dioxide have no bearing on their survival.
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