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CDC - Immediately Dangerous to Life or Health Concentrations (IDLH): Pyridine - NIOSH Publications a

Species Reference LC 50 (ppm) LC Lo (ppm) Time Adjusted 0.5-hr LC (CF) Derived value Rat Fassett & Roudabush 1953 LC 66: 3,600-----6 hr 8,280 ppm (2.3) 828 ppm Rat Smyth et al. 1951 LC 83: 4,000-----4 hr 8,000 ppm (2.0) 800 ppm Rat Vernot et al. 1977 9,00...

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