Air quality standards means concentration limits for air pollutants in outdoor air.
空气品质标准：指室外空气中空气污染物浓度限值。
This paper made some investigation about the permissible concentration limits about contaminations in roadway tunnel from the point of view of the effects on the body.
本文针对该隧洞的特点依据保障隧道内乘驶机动车各人员健康、卫生和隧道的营运安全为原则对污染物浓度设计限值进行了研究。
They recommend revised limits for the concentration of selected air pollutants: particulate matter (PM), ozone (O3), nitrogen dioxide (NO2) and sulfur dioxide (SO2), applicable across all WHO regions.
它们为下述选定的空气污染物的浓度限值提出了修订：可吸入颗粒物(PM)、臭氧(o3)、二氧化氮(NO2)和二氧化硫(SO2)，适用于世卫组织所有区域。
The temperature limits of violent change of salt heave is not fixed, it is related with the concentration of soil pore solution.
盐胀发生剧裂变化的温度区间并不是固定的，它与孔隙溶液浓度有关。
The explosive limits of concentration, explosive morphology, explosive waveforms and their influence factors were investigated.
探索了浓度爆炸极限、爆炸形态与波形及其影响因素；
The experimental results showed that the hydrogen concentration for the flammability limits decrease with the velocity of gas flow in the annular microchamber.
结果表明：由于微细型腔外表面散热损失的增大，火焰传播速度减小，可燃浓度范围明显缩小。
When the attractant or stimulant concentration exceeds the receptor limits, the offering is seen as food.
食 剂或刺激物浓度超过受体的阀值时，供应物就被看作食物。
This Standard specifies the supreme permissible effluent concentration of flue dust, SO2 and nitrogen oxides as well as the emission limits of flue gas blackness by age limits.
本标准分年限规定了锅炉烟气中烟尘、二氧化硫和氮氧化物的最高允许排放浓度和烟气黑度的排放限值。
The emission limits should include the upper limit for emission concentration, the limit of unit product emission at exhaust funnels and the upper concentration limit for unorganized emission.
排放限值包括排气筒最高允许排放浓度，排气筒单位产品排放量和无组织排放最高允许排放浓度。
The emission limits should include the upper limit for emission concentration, the limit of unit product emission at exhaust funnels and the upper concentration limit for unorganized emission.
排放限值包括排气筒最高允许排放浓度，排气筒单位产品排放量和无组织排放最高允许排放浓度。
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