title: Diffusion estimation for small emissions. Preliminary report creator: Briggs, G.A. publisher: National Oceanic and Atmospheric Administration, Oak Ridge, Tenn. (USA). Atmospheric Turbulence and Diffusion Lab. date: 1973-05-01 language: English description: A simplified approach is presented to the calculation of ground level concentrations of effluents from small industrial and fuel burning installations. It is intended to serve as a first approximation to a very complex process. Because each stack, building, and terrain configuration is different, actual ground concentrations may frequently differ from the values calculated here by a factor of two. Nonetheless, this procedure should be useful for determining whether ambient air quality standards are likely to be met, exceeded, or only marginally obtained. It also predicts the locations where the highest and most frequent ground concentrations are likely. Sampling at several such locations is very advisable, unless the predicted concentrations are quite low. In addition, consultation with a specialist in air pollution meteorology may be desirable, especially in marginal or unique situations. The procedures given here were designed especially for source heights of less than 100 m; some of the simplifications made are not valid for large emissions. In the few cases where more than arithmetic formulas are necessary, simple nomograms are provided. subject: Mathematical Models subject: Waste Disposal subject: Diffusion subject: Air subject: Meteorology subject: Distribution subject: Pollution subject: Mass Transfer subject: Waste Management 500200* -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (-1989) subject: Topography subject: Air Pollution subject: Height subject: Sampling subject: Stack Disposal subject: Chemical Effluents subject: Environmental Transport subject: Management subject: Dimensions subject: Fluids subject: Gases subject: Spatial Distribution subject: 54 Environmental Sciences subject: Surface Air source: Other Information: Portions of document are illegible type: Report format: 62 pages format: Text identifier: rep-no: TID-28289 identifier: doi: 10.2172/5118833 identifier: osti: 5118833 identifier: https://digital.library.unt.edu/ark:/67531/metadc1057441/ identifier: ark: ark:/67531/metadc1057441