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Why is the negative ion count, which is measured 10 minutes after the ionizer is turned on, is higher than that of measured just after it is switched on?

Q.11 Why is the negative ion count, which is measured 10 minutes after the ionizer is turned on, is higher than that of measured just after it is switched on?
It is possible that most of negative ions are neutralized by positive ions or absorbed by tiny particles for a while until the air is purified, thus these negative ions are not detected by the ion counter because they are no longer negative ions once neutralized or absorbed. This is why it takes several minutes before negative ions start to be detected.
 
Author: Masaharu Nemoto
(Universal Plan Co., Ltd.)
Highly Accurate Air Ion Counter inti-PRO NT-C101A
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Highly Accurate Air Ion Counter inti-PRO NT-C101A (Highly Accurate Air Ion Counter)

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· It is easy to operate, allows me to adjust the display speed and provides st  Mr. K.W Kyoto, Japan

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· This product provides reliable data as it conforms to the JIS standard. It i  Mr. K Aomori, Japan

· This model provides reliable data as it measures the actual ions while many   Mr. T.K Gunma, Japan

I measured the ion count generated by a negative ion generator and 30,000 (pcs/cc) were detected at 1.8m away from the generator. Is it possible to calculate the ion count detected at 1.0m?
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