Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For First Responders · Hazmat Plume

Hazmat Plume for a search-and-rescue grid

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a search-and-rescue grid live below — adjust the inputs and watch it respond, right in your browser.

Hazmat Plume DispersionLive

Gaussian plume · protective action

Controls

Presets

Release rate (g/s)

Wind speed (m/s)

Action level (mg/m³)

A Gaussian plume estimates how a gas or vapor release disperses downwind. Stability class (A unstable to F stable) sets how fast the plume spreads. The dashed line is the protective action distance where concentration falls below your action level. Screening estimate only — use ERG and monitors on scene.

▶ Run in Python

Data Inspector

Protective distance>20 km

StabilityD neutral

Wind4 m/s

Governing equation

C (x, y) = \frac{50}{2 π 4 σ _{y} σ _{z}} exp (- \frac{y ^{2}}{2 σ _{y}^{2}})

Reading this result: Concentration falls off as the wind stretches and vertical mixing thins the plume — stronger wind and less stable air pull the protective distance in toward the source.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

Also for:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students General version →

More with Hazmat Plume

Hazmat Plume for a house fire Hazmat Plume for a wildfire Hazmat Plume for a hazmat spill Hazmat Plume for a mass-casualty scene Hazmat Plume for a flood rescue Hazmat Plume for a building collapse Hazmat Plume for a chemical leak Hazmat Plume for a triage station

Frequently asked questions

Is this good for first responders?: Yes — this version of "Hazmat Plume for a search-and-rescue grid" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.