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Anion is everywhere. Thundering and lightning, which can often be seen, actually is a kind of way to sterilize and purify the air for they can release a large quantity of anions. This solves the mystery why we will feel the air particularly fresh after raining. In the analysis of the air quality, scientists find the air in forests, waterfalls, mountains or seashore very fresh. This is because there are also a lot of anions in these areas. This arouses the curiosities of many scientists. It is approved that negative ion is everywhere in the nature.
Places studied Anion density
(N-ion/cm3) Research result
Forest, waterfall 100000-500000 Immune naturally
Mountain, seashore 50000-100000 Sterilize and minimize the infection of diseases
Suburb, rural area 5000-50000 Cause headache and physical obstacle
House, room 0-50000 Insomnia, air-conditioning diseases


Can periodically opening the window improve the indoor air quality?
In places where the air is fresh, opening the window periodically can improve indoor air quality. But when the outdoor air is seriously polluted and full of dust, industrial waste gas and car exhaust, it can only cause re-pollution. Therefore only by clearing indoor air waste can we improve the indoor air.