Challenge Indoor air pollution with laser particle counter

Room pollution, must be immediately governance by the air purifier or other way.
The most effective is the most fundamental method of governance, is to completely eliminate pollution sources.
But we are not sure if it is really cleaned or not. so we need the particle counter.
It is made of laser sensor and also the best fan. the accuracy is around ±5%.
Laser particle counter can not only check air quality also can check air purifier too.