<prompt> Particle size which can easily go into the interior of lung and reache alveoli is:0.5 - 3 im3-5 im5-10 im10-15 im  <response>: Ans: a 0.5-3 im Ref: Park, 19th ed,p. 661Particle between 0.5-3 microns are the most dangerous because they reach the interior of the lungs with ease. 