Around 2100000 people die every year because fine particulate matters

The number of premature deaths caused by outdoor air pollution, an average of 1000 people per day,
35 to 400000 of the people are facing death. Specifically, as early as 1997,
the world bank is expected to have 50000 Chinese people die prematurely because of air pollution.
Overall, the report found that air pollution in China has reduced the life of urban residents by 18 years.
So we need the particle counter to check the air quality around us.
Also the laser paricle counter will tell you both the quantity and the weight of fine particulate matters.