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UID:0-8063@eng.ufl.edu
DTSTART;TZID=America/New_York:20260401T125000
DTEND;TZID=America/New_York:20260401T134000
DTSTAMP:20260108T172228Z
URL:https://www.eng.ufl.edu/news-events/events/the-curious-behavior-of-atm
 ospheric-aerosol-acidity-rodney-weber-georgia-tech/
SUMMARY:The Curious Behavior of Atmospheric Aerosol Acidity\, Rodney Weber\
 , Georgia Tech
DESCRIPTION:Atmospheric aerosol particles can reach acidity levels comparab
 le to those of a lead–acid battery due to sulfate-driven strong acidity.
  Sulfur-containing aerosol species have long been associated with adverse 
 health outcomes\, including their central role in the 1952 London Fog mort
 ality event and in the Harvard Six Cities Study (1974–1991). Controlled 
 exposure studies in the 1990s further linked sulfuric acid aerosols to res
 piratory impairments. Although U.S. sulfur emissions and atmospheric sulfa
 te concentrations have declined dramatically over recent decades\, epidemi
 ological studies continue to find strong associations between particle sul
 fur and negative health effects. Paradoxically\, fine particle pH has not 
 changed substantially over this same period\, despite large reductions in 
 the dominant acidic component. Recent studies utilizing aerosol thermodyna
 mic models provide insight into this behavior\, revealing unexpected stabi
 lity in particle acidity under evolving emissions. In this talk\, I will h
 ighlight this phenomenon using results from a health study that spans majo
 r reductions in coal-related sulfur emissions\, and I will discuss new fin
 dings on the drivers of particle acidity across a range of urban and agric
 ultural environments. Together\, these results point to a more refined und
 erstanding of particle acidity and its implications for atmospheric chemis
 try\, air quality\, and human and environmental health.\nAtmospheric aeros
 ol particles can reach acidity levels comparable to those of a lead–acid
  battery due to sulfate-driven strong acidity. Sulfur-containing aerosol s
 pecies have long been associated with adverse health outcomes\, including 
 their central role in the 1952 London Fog mortality event and in the Harva
 rd Six Cities Study (1974–1991). Controlled exposure studies in the 1990
 s further linked sulfuric acid aerosols to respiratory impairments. Althou
 gh U.S. sulfur emissions and atmospheric sulfate concentrations have decli
 ned dramatically over recent decades\, epidemiological studies continue to
  find strong associations between particle sulfur and negative health effe
 cts. Paradoxically\, fine particle pH has not changed substantially over t
 his same period\, despite large reductions in the dominant acidic componen
 t. Recent studies utilizing aerosol thermodynamic models provide insight i
 nto this behavior\, revealing unexpected stability in particle acidity und
 er evolving emissions. In this talk\, I will highlight this phenomenon usi
 ng results from a health study that spans major reductions in coal-related
  sulfur emissions\, and I will discuss new findings on the drivers of part
 icle acidity across a range of urban and agricultural environments. Togeth
 er\, these results point to a more refined understanding of particle acidi
 ty and its implications for atmospheric chemistry\, air quality\, and huma
 n and environmental health.
CATEGORIES:Seminars
LOCATION:NEB 102\, 1064 Center Dr\, Gainesville\, FL\, 32611\, United State
 s
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