Quantifying surface emissions of NOx and VOCs using satellite observations
In this project, we use space-based observations of NO2 and HCHO from the Global Ozone Monitoring Experiment (GOME) to map surface emissions of nitrogen oxides (NOx) and volatile organic compounds (VOCs).

Long-range transport of pollution
How do emissions of pollutants from Asia affect air quality in the United States? Here we examine the variability of transpacific transport of Asian pollution on daily, seasonal, and interannual timescales using the GEOS-CHEM global chemical transport model.

Global cycling of mercury
We are developing a new global simulation of mercury, with particular emphasis on the role of air-sea exchange in the global budget of mercury.

The global budget of hydrogen
As hydrogen fuel-cell technology is being investigated as a new clean alternative to fossil fuels, we need to understand the fate of hydrogen in the atmosphere. In this study we use observations of H2 and its isotope HD together with a global chemical transport model, to place constraints on the current sources and sinks of atmospheric hydrogen.

Chemical forecasting
How much ozone, CO, PAN will tomorrow bring? We have developed an interactive interface to display chemical forecasts on the web. This interface was used operationally in the field for day-to-day flight planning for several aircraft campaigns. We are also providing continuous display of near-real-time GEOS-CHEM simulations since June 2004.