Space-based remote sensing of Earth's atmosphere, especially low-altitude pollution; Evolution of ozone layer; Information retrieval from atmospheric spectra.
I use remote sensing observations by satellites to better quantify and understand the distribution, evolution, sources and sinks of air pollutants. Primarily, I develop models for the retrieval of atmospheric composition from UV-visible spectra acquired by satellites, and then use the results to quantify, map, and evaluate trends in emissions of surface pollutants over urban and industrial locations. I am also interested in understanding and quantifying the evolution of stratospheric ozone and ozone-related trace gases, especially those composed of species of nitrogen and bromine. Additionally, I am engaged in monitoring how the extraction of oil from oil sands is affecting atmospheric composition.