The important of PM2.5 impact on air quality

PM2.5 just a few components content of earth's atmospheric composition, but it has important effect on visibility and air quality.
Compared with coarser of atmospheric particulates, fine particle size small, rich in a lot of poisonous and harmful substances and in the atmosphere for a long time, transmission distance, and to human health and the impact of atmospheric environment quality.
With PM2.5 detecor you can test the air quality around you. if it is good for health or not.
Then can use air purifier to clean the air. to test again with PM2.5 detecor to know the different before clean and after clean.