This study examines the sources and distribution, losses and other properties of tropospheric NO_x over Asia especially India using the global 3D chemistry-meteorology model (MATCH) and GOME NO₂ column. A major objective is to demonstrate how satellite data can be combined with model results to improve our understanding of chemical and physical process in the atmosphere over Asia. The agreement between both the MATCH and GOME regional lifetimes and annual mean total NO₂ columns implies that it is likely that the total NO_x emissions amount used in the current MATCH simulation is about appropriate. The study also brings an improved method of estimating the NO_x emission strength from GOME by taking model estimated lifetime and the uncertainty factor due to remote sources.