PM2.5 is the big largest pollution to air quality

Although the PM2.5 is very small fine particulate matters in the air.
it has very important influence on air quality and visibility.
Compared with the coarse atmospheric particles, the particle size of PM2.5 is small,
the area is large and the activity is strong, which is easy to be poisonous.
particle counter is the best counter to check the particle counter weight and quantity.