夏季,天亮得早,不少人早早到公园晨练。但夏季空气污染物最多,一般早晨6点前还未完全扩散。另外,日出之前,因为没有光合作用,绿色植物附近非但没有过多的新鲜氧气,相反积存了大量的二氧化碳,对健康不利。因此,夏季晨练时间不宜早于6点。 Summer, early morning light, many people early morning exercise to the park. However, most air pollutants in summer are generally not fully diffused until 6 o’clock in the morning. In addition, before sunrise, because there is no photosynthesis, not only there is not too much fresh oxygen in the vicinity of green plants, on the contrary, a large amount of carbon dioxide is accumulated, which is unfavorable to health. Therefore, the morning exercise time should not be earlier than 6:00.