From Dispatch
to Scene Control.

The tones hit. Your crew is moving before the repeat. As the hazmat technician on your department's team, you know what a chlorine release means — this is a Toxic Inhalation Hazard.

Before the apparatus clears the bay, you open FireHazmat on the rig-mounted iPad. The app launches instantly. No loading spinner, no login, no server connection. The complete ERG 2024 dataset is already on-device:

• 3,541 materials searchable by name, UN number, or CAS number
• 62 ERG response guides with full unabridged text — every section, every bullet
• 272 Table 1 isolation distances (small & large spill, day & night)
• 26 Table 3 container-specific distances for the 7 most dangerous TIH substances
• Zero network dependency — works in tunnels, basements, rural highways, dead zones

Dispatch said chlorine-like odor. You type "chlorine" into the search bar. Results appear in under 100 milliseconds. You tap Chlorine — UN 1017, Guide 124.

The detail screen gives you the complete threat picture in a single view:

• TIH — Toxic Inhalation Hazard (red banner, flagged immediately)
• TOXIC and/or CORROSIVE — may be fatal if inhaled or absorbed through skin
• Vapors heavier than air — spread along ground, collect in sewers, basements, tanks
• Strong oxidizer — reacts vigorously or explosively with fuels
• Cylinders exposed to fire may vent toxic gas; containers may explode when heated

Table 3 — Container-Specific Isolation (Large Spill)

Chlorine is one of only 7 Table 3 substances in the ERG — too dangerous for a single isolation number:

No other app puts Table 1 and Table 3 data on a single material detail screen. No flipping pages. No cross-referencing appendices. One tap. Complete picture.

You arrive and establish command upwind at the 1,000-foot perimeter. Through binoculars, you can see a damaged container with a partially obscured placard. The UN number is unreadable, but you can make out the hazard class diamond — shape and color.

You switch to the Placard tab. All 9 DOT hazard class diamonds are displayed exactly as they appear on containers, tank trucks, and rail cars — the same visual language every responder is trained on.

Match the diamond. One tap. You're looking at every material in that class, ready to cross-reference with any shipping papers or facility records you can get your hands on.

• Placards get damaged, melted, obscured by fire and debris
• The hazard class diamond is the most durable identifier on any container
• Paper ERG: flip to a separate placard page, then cross-reference — 30+ seconds under stress
• FireHazmat: one tap, instant filter across 3,541 materials

A second container has ruptured. No placard. No shipping papers. No markings. Vapor is spreading downwind. You are dealing with a completely unknown substance.

This is the scenario the Wizard was built for. You open the Wizard tab and face the single most important question in hazmat response.

On the standard assessment path, you work through the Wizard based on field observations. Each answer feeds into a dynamic risk model.

You start the assessment with the early questions. Pooling liquid visible beneath the container, faint fuel-like sheen — one positive answer in. Risk badge reads LOW.

You confirm flammable solid / spontaneous combustion (the smoldering edge of the container, heat radiating from the puddle). Multiple class indicators stacking. Badge climbs to HIGH.

Then the trefoil. Class 7 indicators present — instrument readings above background, proximity to a known radiological facility. Badge escalates to EXTREME.

• The Wizard builds a cumulative threat profile with every answer
• The risk badge — visible at all times in the header — gives the IC an immediate, data-driven read on scene severity
• No interpretation needed. No ambiguity. The answer changes as the assessment evolves.

All 9 hazard-class indicators answered (after both bifurcation gates returned No). The Wizard delivers a complete response package — not just a PPE recommendation, but everything the entry team needs:

Level A — Full Vapor Encapsulation + SCBA

• Vapor-tight fully encapsulating chemical protective suit
• SCBA worn inside the suit
• 2-person entry minimum with backup team standing by

Proximity Suit Advisory

Fire or active ignition risk present. Standard chemical suits (Level A/B/C/D) are NOT fire-rated. A proximity suit (aluminized, NFPA 1971) is required for operations near open flame or BLEVE risk.

Also Generated

• Possible hazard classes — 3 Flammable Liquid, 4.1 Flammable Solid, 4.2 Spontaneously Combustible, 8 Corrosive
• 6 field instruments to deploy before entry, each with specific back-out thresholds
• Emergency contacts — one-tap CHEMTREC and NRC Hotline

From 11 field observations (2 gates + 9 indicators) to a complete, actionable response plan. Under 2 minutes. No internet required.

With substance identified and PPE confirmed, you need to establish and communicate evacuation zones to incoming units, law enforcement, and EMS staging. The Map tab uses your GPS location and the ERG isolation distances to render three concentric zones on a real-world map.

The map integrates wind direction and speed to model vapor plume dispersion — critical for chlorine, which is 2.5x heavier than air and will settle into low-lying areas downwind.

• Hot Zone — immediate IDLH atmosphere
• Warm Zone — decontamination corridor, controlled access, full PPE
• Plume Spread Zone — protective action zone based on current weather and ERG Table 1 / Table 3 distances

Day vs. night PADs are not the same. Atmospheric stability changes after dark; the Map auto-toggles based on incident location's civil twilight, with a manual override. The pair below shows the same Chlorine release, same wind — one in Day mode (300m PAD), one in Night mode (1,500m PAD).

Zones are established. Entry team is suited in Level A, approaching uphill and upwind. Now: required notifications.

Every number has a one-tap call button and a clipboard copy option. On a hazmat scene, fumbling through contacts or Googling phone numbers is not an option.