<prompt> Paicle size which is inhaled by lung and causes damage is:0.5 micron0.5 - 3 micron3-5 micron5-10 micron  <response>: Paicle size and lung damage: Paicle size Remarks 0.5 micron Brownian motion 0.5 - 3 micron Most dangerous paicle size 3-5 micron Trapped by mid - respiratory tract 5-10 micron Trapped by upper - respiratory tract 10 micron Settle by gravity 