Photochemical model assessment of single source NO and O plumes using field study data.

Single source contribution to ambient O and PM has been estimated with photochemical grid models to support policy demonstrations for National Ambient Air Quality Standards, regional haze, and permit related programs. Limited field data exists to evaluate model representation of the spatial extent and chemical composition of plumes emitted by specific facilities. New tropospheric column measurements of NO and in-plume chemical measurements downwind of specific facilities allows for photochemical model evaluation of downwind plume extent, grid resolution impacts on plume concentration gradients, and source attribution methods.

Photochemical Model Representation of Ozone and Precursors During the 2017 Lake Michigan Ozone Study (LMOS).

Several areas in the Lake Michigan region are violating the human health-based ozone (O) National Ambient Air Quality Standard. Land-water meteorology driven build-up of precursor pollutants (NO and VOC) from mobile and stationary sources undergo photochemical O production and result in seasonal high O episodes during the spring and summertime. Routine and specialized surface measurements coupled with airborne and remotely sensed measurements from the 2017 Lake Michigan Ozone Study (LMOS) provide an opportunity to evaluate photochemical grid model representation of these processes.