its coupling with chemistry will be given. This model now includes many

atmospheric chemistry routines covering biogenic emissions, deposition,

photolysis, and chemical mechanisms. In addition, various atmospheric

aerosol routines (modal and sectional approaches) have been added to

WRF. The chemistry and aerosol routines are usually solved in an

"online" fashion with the meteorological forecast model. In other

words, the interaction and transport of meteorological, chemical, and

aerosol species are calculated using the same physical parameterizations

with no need to interpolate in time and/or space. The most recent

version of this modeling system includes the direct and indirect effects

of aerosols. An overview of the current status of this modeling system

and ongoing as well as future development will be discussed. In addition

some evaluation results, real time applications initial experiments with

chemical data assimilation, and scientific applications will be presented.