Elucidating the atmospheric chemistry of organic nitrates and reactive halogens in laboratory experiments and in ambient air

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There is growing public awareness that the composition of the atmosphere can be altered by man-made emissions with often unintended consequences. One example is the impact of persistent greenhouse gases on climate; another is the impact of pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) on regional air quality. NOx is a byproduct of high-temperature combustion and found, for example, in automobile exhaust. VOCs are emitted naturally by vegetation but also by a multitude of human activities. Accurate knowledge of the impact of NOx and VOCs and their decomposition products on the abundances of ozone and fine particulate matter is needed for policy makers to make informed decisions on pollution control.