The Airborne and Satellite Investigation of Asian Air Quality (ASIA-AQ) is an international cooperative field study designed to address local air quality challenges. Specifically, ASIA-AQ will contribute to improving the integration of satellite observations with existing air quality ground monitoring and modeling efforts across Asia. Satellite air quality observations are evolving with new capabi...

SPECIATE is the EPA's repository of organic gas and particulate matter (PM) speciation profiles of air pollution sources. Among the many uses of speciation data, these emission source profiles are used to: create speciated emissions inventories for regional haze, PM, greenhouse gas (GHG), and photochemical air quality modeling; estimate hazardous air pollutant (HAP) emissions from PM and organic g...

Potential source density function (PSDF) is developed to identify, that is, locate and quantify, source areas of ambient trace species based on Gaussian process regression (GPR), a machinelearning technique. The PSDF model requires backward trajectories and sampling data at a receptor site in the calculation as in the conventional model to locate source areas of ambient trace species, such as the...