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Air Quality
1 tool in the Environmental area.
Air Dispersion Screening
Screening estimate of the ground-level concentration downwind of a stack, a flare or a volume source by the steady-state Gaussian plume of EPA's SCREEN3 procedure: Pasquill-Gifford rural and Briggs urban dispersion coefficients for stability classes A to F, Briggs buoyant and momentum plume rise, stack-tip downwash, buoyancy-induced dispersion, ground and mixing-lid reflections and the wind-speed profile to stack height. The tool scans every stability class and wind speed of the screening matrix for the worst case, finds the maximum one-hour concentration and its distance, converts it to longer averaging times with the EPA screening factors, expresses it in micrograms per cubic metre and ppm, and compares it with an ambient air-quality standard. It is a screening estimate, not a regulatory model run.
1 worked example reproduced, listed on the tool page.