Japan Offspring Fund(JOF) is a consumer group and environmental NGO established in 1984. We have researched issues involving the safety of daily life, including chemical residues, endocrine disruptors, and genetically engineered food.

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Postharvest pesticides etc..
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Testing Vacuum Cleaners
Bad For Your Health
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Filling The Air With Small Dust Particles

Small dust particles can sometimes be seen floating in the air in a sunny room. Even so, not all dust particles are visible to the eye. Using a particle counter, we enter into the world of microns (1 µm or micrometers) where we can detect even the tiniest particles that are less than one thousand of a millimeter small.

Japan Offspring Fund measured the amount of particles in normal office air. The particle counter can be adjusted to measure the amount of dust of different sizes, from 0.3 micron to 5 micron in size. The result can vary depending on the time of day.

Size Amount/Liter
0.3 micron - 2,000,000 particles
0.5 micron - 13,000 particles
0.7 micron - 3,600 particles
1 micron - 2,000 particles
3 micron - 380 particles
5 micron - 56 particles

One of the problems of air pollution is the dust particles which are allergens, i e give rise to or cause allergic reactions. Pollen particles usually measure about 10.0 microns, while their size may vary from one type of plant to another.
Experts agree that using vacuum cleaners can stir up allergens from the floor and cause suffering. Because of this problem, Dr. Terasawa instructs people with allergies and other respiratory problems to wipe floors with a wet rug rather than using a vacuum cleaner.

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