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CATEGORIES:SciSoc – Cambridge University Scientific Society
SUMMARY:Are Airborne Ultrafine Particles the Next Frontier
  in Air Pollution Research? - Professor Roy Harris
 on
DTSTART;TZID=Europe/London:20260317T180000
DTEND;TZID=Europe/London:20260317T190000
UID:TALK243817AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/243817
DESCRIPTION:The atmosphere contains a high number density of p
 articles whose sizes range over many orders of mag
 nitude from 2 nm to over 100 µm in diameter. Airbo
 rne particulate matter is the air pollutant causin
 g the greatest adverse effects upon human health\,
  with most studies focussing upon particles of sma
 ller than 10 µm diameter (referred to as PM10) or 
 smaller than 2.5 µm (referred to as PM2.5)\, measu
 red as mass per unit volume of air. Recently\, the
 re has been an increased focus upon the nanopartic
 le fraction\, usually described by the term ultraf
 ine particles\, which refers to particles with a d
 iameter of <100 nm. Ultrafine particles typically 
 comprise around 90% of all particles in air when m
 easured by number. Epidemiological studies suggest
  that ultrafine particles may have important effec
 ts upon health independent of those of the larger 
 particles which contribute most to PM2.5 and PM10 
 mass. Fundamental research will be described which
  has studied the chemical composition and physico-
 chemical properties of ultrafine particles in dies
 el engine exhaust\, as well as the mechanisms by w
 hich new particles form in the atmosphere from oxi
 dation of atmospheric gases to form molecular clus
 ters\, which grow through condensation of highly o
 xygenated organic molecules observed using state-o
 f-the-art instrumental methods. Abatement of airbo
 rne particle emissions may not reduce ultrafine pa
 rticle concentrations\, and while future trends ar
 e hard to predict\, the scientific determinants wi
 ll be outlined.\n\nTalks are priced at £4 for non-
 Scientific Society members. Scientific Society mem
 bers will have free access to all our talks. Lifet
 ime membership costs £15 and gives free access to 
 all talks\, members-only events and priority acces
 s to oversubscribed SciSoc events.\n
LOCATION:Pfizer Lecture Theatre\,  Department of Chemistry\
 , Lensfield Road
CONTACT:
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