The effects of subtle changes in Earth’s climate on the ozone layer will be explored in two
free, public lectures entitled “The Changing Ozone Layer: A Greenhouse Gas Connection?” at
NASA’s Jet Propulsion Laboratory Thursday, April 18, and at Pasadena City College Friday, April

Dr. Ross Salawitch, a research scientist in the atmospheric chemistry group at JPL, will
discuss how industrial emissions of chlorofluorocarbons deplete the ozone layer and how recent
research by JPL and elsewhere reveals subtle climate changes may also cause ozone depletion.

Salawitch’s past research focused on measuring how human activities affect stratospheric
ozone levels. His research contributed to ratification of the Montreal Protocol on Substances that
Deplete the Ozone Layer and subsequent amendments; agreements that led to the international ban
and phase-out of chlorofluorocarbon production. He also authored a chapter for the 1998 World
Meteorological Organization Scientific Assessment of Ozone Depletion, which proved conclusively
the link between the industrial build-up of chlorine and ozone depletion. His current research is
focused on understanding how the ozone layer will evolve as chlorine levels recede and climatic
change affects stratospheric humidity and temperature.

Salawitch came to JPL in 1994 from Harvard University, Cambridge, Mass., where he was a
research associate and postdoctoral fellow in atmospheric chemistry. He is currently a visiting
research associate at the California Institute of Technology in Pasadena, and he has authored nearly
100 research papers.

Both lectures begin at 7 p.m. Seating is on a first-come, first-served basis. The JPL lecture
will be webcast live and will also be available after the event at .

The lecture at JPL, located at 4800 Oak Grove Dr., Pasadena, off the Oak Grove Drive exit
of the 210 (Foothill) Freeway, will be held in the von Karman Auditorium. The Friday lecture will
be held in Pasadena City College’s Vosloh Forum at 1570 E. Colorado Blvd.

For more information, visit or call
(818) 354-0112. JPL is a division of the California Institute of Technology in Pasadena.