Students will write a paper and give a 15-minute presentation during the last week of class and finals week. A list of possible topics is included below, or students can pick a topic of their own choosing. The paper should be at least 5 pages long (but no more than 10 pages) using ~1.5 line spacing and include at least 10 references, as well as figures to illustrate your points.

• Air pollution in mega-cities (Dan Alrick - Mexico City; Maurizio DiPierro)
• Air pollution and health
• Intercontinental transport of pollutants (Ryan Eastman)
• Geoengineeing (Sandra Penny)
  
• Biogenic emissions of VOCs (Jerry Casson)
• Secondary Organic Aerosol formation (Sara Harrold)
  
• Composition of polar stratospheric clouds (Mike Warner)
  
• Biomass burning, and its effect on tropospheric ozone levels in tropical regions (Kristen Rasmussen)
• Halogen chemistry in the marine boundary layer
• Ozone depletion events in the arctic boundary layer
• Is the global oxidizing capacity of the atmosphere changing?
• Satellite observations of tropospheric composition (Anthony Dildake)
• Satellite observations of stratospheric composition
• Lightning and the global NOx budget - (Elizabeth Barnes)
• Recent trends in CH4 (Daniel Emmanuelson)
• Glacial-interglacial changes in CH4 (Eric Sofen)
• Planetary photochemistry
• Effects of aerosols on tropospheric ozone
• Cloud chemistry
• Formation of the stratospheric ozone layer in Earth's early atmosphere (~2 billion years ago)
• Mesospheric clouds (Brian Smoliak)
• Climate change - polar ozone depletion feedbacks (Reid Wolcott)
• Volcanoes and atmospheric chemistry (Katrina Virts)
• The 2002 Antarctic ozone hole (Phuong-Tra Dinh)
• Sources of lead (Haizhou Liu)