Is dirt really such a Bad Thing?

Is dirt really such a Bad Thing? - Telegraph
This week the Wellcome Collection is putting on a filthy exhibition. It celebrates dirt in all its variety and our attempts to keep it at bay. Just a few hundred yards from its miscellany of objects once towered the dust heaps of Kings Cross, scene of Dickens’s Our Mutual Friend and a reminder of the capital’s proud boast, as revealed by a recent poll, to be the dirtiest city in Europe. We could soon win another plaudit. My own office is across the street from the Wellcome. I have been cleaning it out and have left each day black with filth from the tiny (and noxious) particles that belch from lorry exhausts on Euston Road and which, unless a plan to control them emerges soon from the Mayor, may merit a huge fine from Brussels.