Free open-source library of 30+ HSE (Health, Safety, Environment) calculators — TRIR, LTIR, LTIFR, DART, EMR, severity rate, WBGT heat stress, noise exposure, hand-arm vibration, REBA, RULA, NIOSH lifting, fire load, evacuation time, risk matrix. Pure Python 3.11+, zero runtime dependencies, regulation-cited (OSHA, HSE UK, ISO 45001, ILO, NIOSH, ACGIH).
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