Emissions of nitrogen oxides (NO_x) and/or sulfur oxides (SO_x) from individual point sources, such as coal-fired power plants, with tall stacks contribute to reduced air quality. These primary species are important precursors of various oxidant species (e.g. O_3) and secondary fine particulate matter (PM_(2.5)). In an attempt to provide a more realistic modeling treatment of the dynamic and chemical processes governing pollutants in subgrid scale pollutant plumes emanating from major point sources within an Eulerian 3-D grid modeling framework, a plume-in-grid (PinG) approach was developed and incorporated into the one atmosphere, Community Multiscale Air Quality (CMAQ) modeling system (Byun et al., 1998). The PinG technique was designed to spatially resolve pollutant plumes and to simulate their gradual growth downwind, which permits photochemical processes in plumes to evolve in a more realistic manner. This paper outlines the photochemistry and recently installed aerosol model treatments contained in the CMAQ PinG. Selected results from initial test applications are presented, however, more material will be displayed in the conference poster.
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