Table 4 The main irritant and asphyxiant components in fire gases and their toxic potencies (in terms of incapacitating; and lethal concentrations) for a 30-min exposure period (ISO 13344 1996: ISO 13571 2012)
| Yield largely independent of fire condition | Yield decreases as ventilation decreases | Yield increases as ventilation decreases |
|---|---|---|
| HF (500; 2900 ppm) | CO2 (~7 %; ~10 %) also replaces O2 and increases respiration rate). | CO (1170 ppm; 5700 ppm) |
| HCl (1000; 3800 ppm) | NO2 (170; 250 ppm) | HCN (82 ppm;165 ppm) |
| HBr (1000; 3800 ppm) | SO2 (150;1400 ppm) |
Acrolein (30 ppm;150 ppm) Formaldehyde (250 ppm; 750 ppm) Aromatics, aldehydes, ketones etc. |