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SUMMARY:Air Pollution in Delhi\, India - Ying Chen\, Lancaster
DTSTART:20190304T141500Z
DTEND:20190304T151500Z
UID:TALK119239@talks.cam.ac.uk
CONTACT:Scott Archer-Nicholls
DESCRIPTION:Delhi\, the capital city of India with more than 10 million po
 pulation\, is suffering one of the worst particulate matter (or PM2.5) pol
 lution over the world. However\, the long-term studies of it and mitigatio
 n devising is far from enough for advising Indian government. In this talk
 \, I will briefly summarize the local characters and the unique of PM2.5 p
 ollution in Delhi\, based on continuous ground observations over past 4 ye
 ars. We find a distinct seasonal variation of PM2.5 mass concentrations an
 d a shift of morning rush hour from winter to summer\, but a negligible we
 ekend effect. The Diwali fest worsens short-term exposure to PM2.5 by a fa
 ctor of approximately 1.8\, and leads to a mortality of approximately 22 p
 erson/day in Delhi. Our results also show that the atmospheric particles i
 n Delhi are much more hygroscopic than the particles in Beijing or Asian a
 verage. It means\, in addition to the great health burden\, more significa
 nt cloud activation and hence greater influences on climate and hydrologic
  cycle are expected from particles in Delhi. It also implies a different c
 hemical constituent (possibly less organics than Beijing and Asian average
 ) of Delhi PM2.5. With help of a regional chemical transport model (WRF-Ch
 em) and an advanced statistical method (Gaussian Process emulation)\, we d
 iscuss the possibility of a series of mitigation plans. We foresee an incr
 ease of ozone risk in a current wide-agreed plan\, which is mainly focusin
 g on reducing PM2.5 only. At the end of the talk\, I will show you an opti
 mized mitigation plan\, concluded from thousands of sensitivity simulation
 s/emulations. This plan can effectively reduce the PM2.5 in Delhi meanwhil
 e minimize ozone risk\, although much greater politic efforts are required
  for regional controls over the National Capital Region of India.
LOCATION:Pfizer Lecture Theatre\, Department of Chemistry
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