What is the Range for the air particle counter result

We use air particle counter to check the air quality around us and also demo air purifier.
But what is the rang of the result. what is the good. what is the excellent?

Excellent = 0 -35 

very good =  35  to 75 

Mild =  75 to 115

severe = 115  to 150

serious = 150 to 250

With the particle counter to confirm our breath air quality and then treatment.


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reprinted: http://www.ionaircleaner.com/health_and_environment/2320.html