Both fine and coarse particles in an odorous plume enter the nasal cavity and can induce nasal irritation. However, these particles differ in the degree to which they traverse the respiratory tract."
"Fine particles include particulate matter with sizes less than 2.5 uM (PM 2.5).
These particles are more likely than coarse particles to cause respiratory health effects because they reach the gas-exchange region of the lung."
'ULTRA-FINE PARTICLES (i.e. THOSE WITH A DIAMETER 0. 1 uM OR LESS) MAY BE EVEN MORE TOXIC THAN LARGER SIZED PARTICLES PRODUCING SEVERE PULMONARY INFLAMMATION AND DAMAGE AND EVEN AFFECTING MORTALITY.' (pg. 31)
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