What is the PM2.5 result in a rainy day

Rainy days, the air is often very wet, what about the pm2.5 result ?
Research shows that PM2.5 result will be lower in a rainy day also depends on the rainfall.
So we can use the particle counter to check the PM2.5 indoor.
Air particle counter will be the best helper to demo air quality and air purifier.


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reprinted:  http://www.ionaircleaner.com/health_and_environment/2392.html