This project aims to quantify the impact of light-absorbing aerosols from the burning of fossil fuels and biofuels on air quality and the chemical make-up of our atmosphere. In doing so, we will explore the major uncertainties caused by aerosols that exist today in the modeling of global atmospheric chemistry by improving the NASA Global Modeling Initiative (GMI) model, among others. Through this work, we'll be able to advance predictions of changes in air quality and climate change associated with aerosols.