What is the ideal humidity?
It can be confusing when there are so many symptoms of dry air and many, some similar symptoms in air that is too humid. The the incidence of allergies, asthma, viruses and bacteria for instance, increase at both ends of the humidity scale, although the allergies and asthma may have different causes and the viruses and bacteria will be different strains, there is, nevertheless, a happy humidity medium that we should aim for to achieve the best environment for ourselves, our homes and our possessions. The various professional guidelines on building and ventilation tend to agree that the ideal humidity level should be between 40 and 60% RH, and as close to 50% as can be economically achieved. Many offices and modern homes can have humidity levels in the region of 25-30%, and all of the symptoms that associate with dry air. With a suitable humidifier used in a home or office, the humidity level is very easily and cheaply increased to the desired level.
