Particle counter confirm particulates harm to body

Paritlc counter is very hot selling in these years because of the bad air quality around us.
Particulate matters is very bad to human health because it can go inside body through breath.
It harm to the eyes, the visual range is reduced, chronic bronchitis, asthma and childhood asthma,
mortality, increased visibility, traffic accidents increased and so on.
Laser particle counter is the best machine to confirm the both PM2.5 and PM10 in the air.