灰霾天的空气污染物浓度高于非灰霾天。
The concentration of pollutants of haze was higher than non-haze days.
空气品质标准：指室外空气中空气污染物浓度限值。
Air quality standards means concentration limits for air pollutants in outdoor air.
同时，贴地大气层结温度递减率与空气污染物浓度呈显著反相关。
At the same time, the correlation coefficient between temperature vertical decrease rate of low layer atmosphere and air pollutant concentration is negative.
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