ABSTRACT
All combustion sources generate exhaust products that enter the atmo sphere; often, significantly changing its trace chemical content. Atmospheric scientists face the challenge of determining how the exhaust pollutant gases and particles emitted by combustion sources impact the atmosphere and how this impact depends on the spatial and temporal dis tributions of these emissions. Environmental regulators and managers must decide which emissions need to be reduced (and to what level) or shifted in place or time to minimize harmful effects. Combustion scientists and engi neers are charged with producing new or retrofitting older energy conver sion devices so they produce lower levels of exhaust pollutants while maintaining or enhancing fuel efficiency and power output. All of these tasks require accurate, high-time-resolution measurements of emitted exhaust species over the full operating range of combustion powered indus trial, commercial, and transportation systems.
