大气中含量很微小的气体组分，即除氮、氧和惰性气体以外的其他气体组分。它们的浓度大多低于100微克/米3。
在用CO激光监测大气微量气体或污染气体时，必须根据实际大气状况，进行必要的水汽订正。
When monitor trace gases of the atmosphere or pollution gases by means of co laser, one must correct for water vapor attenuation according to the actual condition of the atmosphere.
这些微量气体除了在污染最严重的大气外，是不能凭嗅觉察觉到的。
These trace gases are not detectable by smell in any but the most heavily polluted atmosphere.
上周在华盛顿一个语气强硬的演讲中，斯特恩先生表示，如此微量缩减将无助于影响改变气候气体的大气浓度。
In a tough speech in Washington last week, Mr. Stern said that such modest reductions would do little to affect atmospheric concentrations of climate-altering gases.
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