indoor air quality decline and deterioration, directly or indirectly affect people adversely affected.
Particle counter is the best helper to help use to check the indoor air quality.
It can check the fine particulate matters which is the main reason cause the pollution.
The air particle counter will tell you the air quality arund us and you can know it is good to health or not.

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reprinted: http://www.ionaircleaner.com/health_and_environment/2290.html
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