它是我国环境卫生标准系列项目之一。
That is one of the hygienic standard series for environmental health is China.
结果：重庆市各主要交通干道尾气污染物浓度均超过国家环境卫生标准。
Results: the exhaust pollutant in the main roads in Chongqing exceed the national environmental health standard.
结果：重庆市各主要交通干道尾气污染物浓度均超过国家环境卫生标准。
Results: the exhaust pollutant in the main roads in Chongqing exceed the national environmental health standard.
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