Environment, Air Quality, and Climate: Emission, transport, transformation, and fate of pollutants; agricultural air quality; climate change; biogeochemical cycling of pollutants; wildfire emissions and transport; measurement and modeling of biogenic emissions of trace gases; photochemical oxidants and gas-to-particle conversion; biospheric-atmospheric interactions; bioenergy; aqueous waste purification; bioenvironmental engineering; and pollutant monitoring and control.