Anthropogenic emissions of VOC and NOx within the OTAG domain from area and point sources contribute to the formation of excess anthropogenic ozone on top of the tropospheric background. Point sources are generally from tall stacks and located mostly in rural areas with NOx rich emissions. Area sources arise mostly from low level emissions in urban metropolitan areas and they are rich in VOC as well as NOx. Temporally, area sources have both a diurnal and seasonal cycle, while point sources are more invariant with time.
Bright lights represent the urban-metropolitan areas.
Area source emissions for NOx. The high emission densities are located in the vicinity of urban-metropolitan areas. Point source emissions for NOx. The high emission densities are located mostly in the industrial Midwestern states. Submit your comments, feedback, questions, and ideas pertaining this page.