In this study, 30 subjects were exposed to different combinations of air temperature (T_a: 24, 27, and 30°C) and CO₂ level (8000, 10 000, and 12 000 ppm) in a high‐humidity (RH: 85%) underground climate chamber. Subjective assessments, physiological responses, and cognitive performance were investigated. The results showed that as compared with exposure to T_a = 24°C, exposure to 30°C at all CO₂ levels caused subjects to feel uncomfortably warm and experience stronger odor intensity, while increased mental effort and greater intensity of acute health symptoms were reported. However, no significant effects of T_a on task performance or physiological responses were found. This indicated that subjects had to exert more effort to maintain their performance in an uncomfortably warm environment. Increasing CO₂ from 8000 to 12 000 ppm at all T_a caused subjects to report higher rates of headache, fatigue, agitation, and feeling depressed, although the results were statistically significant only at 24 and 27°C. The text typing performance and systolic blood pressure (SBP) decreased significantly at this exposure, whereas diastolic blood pressure (DBP) and thermal discomfort increased significantly. These effects suggest higher arousal/stress. No significant interaction effect of T_a and CO₂ concentration on human responses was identified.

中文翻译：

---

人类对高浓度二氧化碳和气温的反应

在这项研究中，30名受试者暴露于不同的空气温度的（组合Ť_一个：24，27，和30℃）和CO ₂水平（8000，10 000，和12 000 ppm的）在高湿度（RH： 85%) 地下气候室。对主观评估、生理反应和认知表现进行了调查。结果表明，与暴露于T _a  = 24°C 相比，暴露于 30°C 在所有 CO ₂水平下都会导致受试者感到不舒服的温暖和更强烈的气味强度，同时脑力消耗增加和急性健康症状的强度更大报道。然而，T _a没有显着影响在任务表现或生理反应上被发现。这表明受试者必须付出更多努力才能在令人不舒服的温暖环境中保持表现。在所有T _{a 下，}将CO ₂从 8000 ppm 增加到 12 000 ppm 会导致受试者报告更高的头痛、疲劳、激动和情绪低落的发生率，尽管结果仅在 24 和 27°C 时具有统计学意义。在这种暴露下，文本输入性能和收缩压 (SBP) 显着下降，而舒张压 (DBP) 和热不适显着增加。这些影响表明更高的唤醒/压力。T _a和 CO ₂没有显着的交互作用 确定了人类反应的浓度。