Hello! I have a question about combustion and low oxygen. I’m writing an article and I want it to be scientifically accurate. The hypothetical scenario in question is a worldwide event where world wide oxygen is reduced to about 11% to 12%. This event will last 4 days. Just before this event there are cataclysmic fires that are put out by the sudden reduction in oxygen. My first question is whether smouldering would still be possible. Obviously fire wouldn’t be possible but would there still be smouldering leftover from the giant fires. Would the smouldering wood still emit a glow? If you blew or channeled air continuously onto the smouldering wood could you still generate a flame even briefly? Also, could people survive a full four days at this level of oxygen? Could they survive at 9% for a full four days without serious health effects. Lastly, if this event was caused by a super volcano would the amount of C02 that displaced the oxygen be lethal over a full four days if the co2 was somehow contained at ground level? Thank you, any help is greatly appreciated!