tube etiquette: more essential in balmy weather

So it's been a pretty warm week for March: the sun is shining, people seem happy and walking is definitely preferable to using the tube - where possible.

For this means that the London Underground will undoubtedly be awash with the great unwashed. 

Having my nose planted against someone's unwashed armpit is a travesty at the best of times but in this sort of weather it's simply unbearable. 

I'm considering taking some air freshener or Febreze with me every time I travel on the tube but if I ever sprayed it people might think I was a terrorist, not simply someone who likes to smell something slightly better than body odour.

So what do we do about this situation? Some people may not know they smell, others may know but suffer BO no matter how many times they wash. I do not wish to upset or humiliate these poor people.  I merely wish to educate those who do not seem to care or do not wash about the importance of a clean armpit.

No doubt this situation is not helped by the need for an overcoat and jumper outside but then sweltering within them on the tube carriages themselves.

I find myself shivering at 6am when I get up and get the overground into town but then sweating as I get on to the packed tube for the last leg of my journey.  So, my own answer to this crisis is to dress light but have a mini hot water bottle for the first leg as extra cold protection.

I realise I am obsessing about this far too much.  Perhaps the more simple answer is to simply walk and not use the tube. But, on the times that I do, surely it's not too much to ask that my nostrils remain free of pungent stenches from those that can use soap and deodrant?