The sampler on the right is the PM2.5 inlet for the equipment seen in the picture below. Other PM2.5 particles are soil-related and are the result of road dust, construction, and agriculture. The EPA decided to establish ambient air quality standards for PM2.5 in 1997. The reason for this is that recent health studies indicate that This equipment measures the amount of PM2.5 in the air you breath. PM2.5 is a problem for some individuals.
Smaller particles travel deeper into the lungs of individuals.
These particles can irritate and damage the lungs and cause breathing problems. People that are most affected are individuals with asthma or other lung or heart disease. The elderly and children are also vulnerable to the effects of PM2.5.