Overview#
A PSAP dispatcher receives a call: a tanker truck has overturned on a motorway and fluid is spreading across the road surface. The driver can read one label: UN 1203. The dispatcher searches the Chemical Register. Within two seconds: the substance is petrol, flash point low, evacuation zone 300 metres, water reactivity nil, PPE for first responders includes splash goggles and chemical resistant gloves. The dispatcher relays the guidance before the first fire unit arrives on scene.
That speed is the difference between first responders arriving prepared and arriving blind. The Chemical Register domain provides instant access to chemical identification, hazard assessment, and response procedures from authoritative sources, directly within the dispatch workflow.
Key Features#
- Chemical search and autocomplete by name, CAS number, UN number, or common names with relevance scoring.
- Firefighting procedure guidance with extinguishing agent recommendations and water reactivity checks.
- Acute Exposure Guideline Levels (AEGL-1/2/3, IDLH) for dispersion modelling integration.
- PPE requirements with exposure-level specific respiratory, skin, eye, and glove protection recommendations.
- Chemical-aware plume modelling with evacuation zone generation and geofence integration.
- Multi-chemical reactivity matrix and combined hazard assessment.
- Role-specific DO/DON'T checklists and step-by-step standard operating procedures.
- First aid instructions and spill response guidance with isolation distances.
Use Cases#
PSAP dispatchers provide immediate hazmat guidance to first responders during hazardous materials incidents, accessing substance-specific procedures from authoritative sources without switching systems.
Firefighters arriving at hazmat scenes access real-time chemical safety data on mobile devices, getting PPE requirements and firefighting procedures specific to the substance involved before committing to the hazard zone.
Emergency managers calculate evacuation zones using dispersion modelling parameters drawn directly from verified AEGL data, producing geofenced evacuation boundaries that reflect the specific substance's toxicity profile.
Multi-agency incident commanders handling incidents involving multiple chemicals use the reactivity matrix to assess combined hazard profiles, understanding interaction risks before committing personnel to mixed-contaminant environments.
Integration#
Integrates with dispatch, geofencing, and alert domains for end-to-end hazmat incident response. Supports dispersion modelling services for evacuation zone calculations.
Open Standards#
- UN Recommendations on the Transport of Dangerous Goods (UN Model Regulations): UN four-digit numbers (e.g., UN1203) are the primary incident-time identifier for hazardous materials; the register maps every substance to its UN number for placard lookup and ERG guide resolution.
- UN Globally Harmonised System of Classification and Labelling of Chemicals (GHS): All chemical records carry the full GHS classification, including the standardised pictogram codes (GHS01, GHS09), signal words (Danger/Warning), and H-code and P-code sets as defined by the UN GHS Purple Book.
- NFPA 704 (Standard System for the Identification of the Hazards of Materials for Emergency Response): Each chemical profile stores the four-quadrant NFPA fire diamond ratings (health, flammability, instability, and special hazards on the 0, 4 scale) for rapid visual hazard communication to first responders.
- US DOT/PHMSA Emergency Response Guidebook (ERG): Guide numbers, initial isolation distances, protective action distances, and first-responder procedures are sourced directly from the ERG and linked to chemicals via UN number, giving dispatchers the same authoritative data used by hazmat crews.
- Acute Exposure Guideline Levels (AEGL): The EPA/National Academies tiered exposure thresholds (AEGL-1, AEGL-2, AEGL-3, and IDLH) are stored per substance and feed Gaussian plume dispersion calculations to derive evidence-based evacuation zones.
- CAS Registry Number: Chemical Abstracts Service unique numeric identifiers are stored for every substance and used as the canonical deduplication key for upsert operations and cross-source record linkage.
- GeoJSON (RFC 7946): Evacuation zone polygons and plume-contour geofences generated from dispersion modelling are encoded as GeoJSON Feature geometries for downstream map and alert integrations.
Last Reviewed: 2026-02-05 Last Updated: 2026-04-14