riverrock wrote:For ref:
35ppm The maximum allowable concentration for continuous exposure for healthy adults in any 8 hour period, as recommended by the
Occupational Safety and Health Administration (OSHA).
200ppm Slight headache, fatigue, dizziness, nausea after 2 - 3 hours.
400ppm Frontal headaches within 1 - 2 hours, life threatening after 3 hours.
800ppm Dizziness, nausea and convulsions within 45 minutes. Unconsciousness within 2
hours. Death within 2 - 3 hours.
Regarding the above table, presume that is for breathing at typical sea level pressures (may even use ISA). As the oxygen partial pressure reduces with altitude, I suggest the above safe limits will reduce. Frank?