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SUMMARY:Are Airborne Ultrafine Particles the Next Frontier in Air Pollutio
 n Research? - Professor Roy Harrison
DTSTART:20260317T180000Z
DTEND:20260317T190000Z
UID:TALK243817@talks.cam.ac.uk
CONTACT:129301
DESCRIPTION:The atmosphere contains a high number density of particles who
 se sizes range over many orders of magnitude from 2 nm to over 100 µm in 
 diameter. Airborne particulate matter is the air pollutant causing the gre
 atest adverse effects upon human health\, with most studies focussing upon
  particles of smaller than 10 µm diameter (referred to as PM10) or smalle
 r than 2.5 µm (referred to as PM2.5)\, measured as mass per unit volume o
 f air. Recently\, there has been an increased focus upon the nanoparticle 
 fraction\, usually described by the term ultrafine particles\, which refer
 s to particles with a diameter of <100 nm. Ultrafine particles typically c
 omprise around 90% of all particles in air when measured by number. Epidem
 iological studies suggest that ultrafine particles may have important effe
 cts upon health independent of those of the larger particles which contrib
 ute most to PM2.5 and PM10 mass. Fundamental research will be described wh
 ich has studied the chemical composition and physico-chemical properties o
 f ultrafine particles in diesel engine exhaust\, as well as the mechanisms
  by which new particles form in the atmosphere from oxidation of atmospher
 ic gases to form molecular clusters\, which grow through condensation of h
 ighly oxygenated organic molecules observed using state-of-the-art instrum
 ental methods. Abatement of airborne particle emissions may not reduce ult
 rafine particle concentrations\, and while future trends are hard to predi
 ct\, the scientific determinants will be outlined.\n\nThis talk will be fr
 ee for all to attend.
LOCATION:Pfizer Lecture Theatre\,  Department of Chemistry\, Lensfield Roa
 d
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