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Summary (from the source)
In cases of necessity, there is nothing wrong with the pilgrim in ihram wearing a mask such as if he has an allergy in his nose and he needs to wear a mask.
Question
Is it permissible for the pilgrim in ihram to wear a mask?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
Shayk Ibn `Uthaymin (may Allah have mercy on him) said:
“In cases of necessity, there is nothing wrong with the pilgrim in ihram wearing a mask, such as if he has an allergy in his nose and he needs to wear a mask, or if he is passing through thick smoke and needs to wear a mask, or he is passing by a smell and needs to wear a mask. There is nothing wrong with that.” (Majmu’ Fatawa Ibn ‘Uthaymin, 22/130, 131)
For more, please see these answers: 96679 , 218960 , 49034 , and 11356 .
And Allah knows best.
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