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🌆 Photochemical Smog: NOx-VOC-Ozone Cycle Simulator

Watch tropospheric photochemical smog form over a city: NO2 photolysis by sunlight, ozone formation, the O3+NO night titration reaction, and VOC+OH radical cascades that let ground-level ozone build through the afternoon.

Chemistry & Materials3DModerate60 FPS💨 Air & Wind

⚙ Under the hood

3D box-model simulation of Los Angeles-type tropospheric photochemical smog over a city: NO2 photolysis by sunlight, O3 formation, the O3+NO night-time titration reaction, and VOC+OH radical chemistry that regenerates NO2 without consuming ozone, letting ground-level O3 accumulate through the afternoon. Tune NOx and VOC emission rates and scrub or run the time-of-day clock, and watch a live 24-hour NOx/VOC/O3 forecast chart update.

Three.jsphotochemical smogtropospheric ozoneNOx VOC chemistryatmospheric chemistryInstancedMesh

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install