Popular science 【The earlier the morning exercise time, the better?】 This is not the case. The temperature in the autumn morning is relatively cold, and if you do not pay attention, you will have a cold and flu; then there is that the plant will absorb oxygen and release carbon dioxide under the condition of no light at night, so there will be a large amount of carbon dioxide in the woods in the morning, at this time, the oxygen content in the air is insufficient, the fog has dust, and the long-term morning exercise in this environment will have chest tightness, shortness of breath, arrhythmia and memory loss and other symptoms. Recommendation: Morning exercise time is best selected at 6 to 7 o'clock, that is, after sunrise, when the plant will begin to photosynthesis, and the air quality will gradually improve. (via Zhongshan Sixth Courtyard)
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Source: Guangdong 12320
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