It is Fard and part of wudhu. However, if the danger is eminent and real, one is exempted from whatever is truly harmful and you may skip this or minimize and offer tayammum afterwards for the missed part.

If in my area the water contains bacteria which is fatal when it enters through the nose. Is it permissible while making wudu that I use my fingers to wet my nose or not to take the water as up as possible as the sunnah directs us to and ? And is putting water in the nose a fardh part of wudu?

Purity | August 26, 2014 7:57 am
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I saw on your post on how to make wudu that making the intention for wudu is under Mustahabb Part of making wudu. So if someone just says Bismillah and makes wudu without making the intention to purify themselves is their wudu still valid?
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One ques about purity – I realised some najasa may have come on my pad. So I immediately went & wore another pad on it. I touched the old pad in the process which may have najasa on it. I wore undergarment & lower garment. Then I felt I should have washed my hands before wearing these. But I ignored it. Is it fine? Or are the clothes impure now because I had not washed hands.