🏭 Stack Plume Dispersion: Gaussian Puffs and Stability Classes (2D top view)

2D top view of a smoke-stack plume built from Gaussian puffs. Set wind speed and direction, release rate, stack height, alert threshold and Pasquill stability class A to F and watch the ground-level concentration map, four sensor traces and the downwind and crosswind profiles. Same puff growth law and release schedule as the 3D page, with four in-page numerical checks.