This is an excellent time of the year for piano tuners. But it’s not so good for sufferers from catarrh, wearers of contact lenses or collectors of fine furniture. With the arrival of the winter house windows have no been shut for some while, and rooms generously heated to keep out the cold. This can dry the air to an uncongenial extent. In these parched conditions plants wilt, wooden furniture shrinks, pianos go out of tune, eyes itch, nails flake, the surface of the skin dries and nasal passages become blocked with catarrh.
We feel stuffy, not because the inside air is polluted or depleted of oxygen, but because it carries insufficient moisture. Human beings feel no discomfort if they’re living in atmospheres with too little oxygen to light a match, but they soon feel miserable if the air around them becomes excessively dry. At one time this was rarely a problem in Britain, when people lived in draughty homes lit by one or two open fires. It’s now become a genuine hazard, following the introduction of powerful central heating systems, the use of heat generating TV sets, computers, fridges and freezers, and the arrival of hermetically sealed, draught-proofed buildings.
This is a particularly risk for people living in cities, where the increased use of heat-producing machinery, the ducting of open streams and gullies, and the concrete covering of gardens, parks and playing fields, has led to a drop in outdoor humidity levels. A study of the meteorological records in Tokyo has revealed that during the past fifty years, following the loss of the city’s parks and open waterways, there has been a steady fall in humidity levels from a comfortable January average of 67 per cent to today’s less pleasant 49 per cent. Environmentalists warn that Tokyo could soon be turned into a concrete desert. This has been confirmed by a spokesman for Japan’s meteorological association, who warns: ‘Just one per cent of humidity makes a big difference to humans. It makes you more vulnerable to colds. It affects the skin.’ Continue reading ‘Low Humidity – A Seasonal Household Risk’ »