Diameter of particles of 2.5 microns most harmful to people body

For environmental science being suspended particles in the air of the micro pollutants are a major source of air pollution.
Less than 10 microns in diameter of the suspended particle is defined as the inhalable particles were
they can accumulate in the lungs harm to people's health. Diameter of particles of 2.5 microns or
less most harmful to the human body because it can directly into the alveoli.

Scientists said PM2.5 per cubic meter of the content of the particles in the air this value comes higher on behalf of the more serious air pollution.