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不少中老年朋友的晨练时间定在天亮之前或天朦朦亮的时候，以为此时环境幽静，空气清新，锻炼效果最佳。其实，据专家研究，后半夜经常出现的近地面逆温层，使得空气污染物在早晨６点左右最不易扩散，常常是污染的高峰期。此外，清晨气温低（每天最低气温一般都出现在早晨５点
Many middle-aged friends morning exercise time is set before dawn or Meng dim bright, when the environment was quiet, fresh air, exercise the best. In fact, according to expert studies, the near-surface inversion layer, which appears frequently in the middle of the night, makes air pollutants the most difficult to disperse at around 6 am and is often the peak of pollution. In addition, the early morning temperature is low (the daily minimum temperature usually appears at 5:00 in the morning