The average concentration of ozone, one of the most common pollutants, is about half its level in the early 1990s, when the air was at its dirtiest (see chart).
20世纪90年代，空气污染时最严重时（如图所示），臭氧这种最常见的污染物的平均浓度大约是安全浓度的一半。
The average concentration of particulates in city air during 2008, for example, was six times the ideal standard recommended by the World Health Organization.
以2008年全年的数据为例，北京市市区空气单位体积微小聚合颗粒数是世界卫生组织标准的6倍。
The average concentration of ozone, one of the most common pollutants, is about half its level in the early 1990s, when the air was at its dirtiest (see chart).in.
20世纪90年代，空气污染时最严重时(如图所示)，臭氧这种最常见的污染物的平均浓度大约是安全浓度的一半。
By analysing the column settling test data, the average concentration of the settled suspension can be obtained and then the settling efficiency can be estimated easily.
所以可以不通过沉速分析，直接依据浓度数据来估计沉淀效率。
They estimate the average concentration of plastic in this area is about 4,000 pieces per square mile, though it is as high as 250,000 pieces per square mile in some places.
据他们估计，这一海域的塑料垃圾平均密度大约在每平方英里4000块左右，一些海域的密度最高可达到每平方英里25万块。
A new generation atmosphere diffusion model (ADMS model) and Regulatory model were used to forecast the average concentration values of H2S in a complex terrain of Chongqing.
应用新一代的大气扩散模型(adms模型)预测重庆某个复杂地形区域的H2S地面浓度，并分别将其与导则模型的预测值与实际监测值进行了对比统计分析。
The researchers found that the long-term death rate from lung cancer rose by 8 per cent for every 10-microgram increase in the average concentration of PM2.5s per cubic meter.
他们发现，每立方米PM2.5的平均浓度每增加10微克，在长期的作用之下，肺癌导致的死亡率就会增加8％。
Differential optical absorption spectroscopy (DOAS) makes use of the flue gas pollutant different optical absorption characteristic at the UV-VIS wave band to measure their average concentration.
差分吸收光谱法是利用气体污染物在UV - VIS波段对光有不同的吸收特性来测量其平均浓度。
The subdivision interpretation results by deconvolution are compared with those obtained by progressive substitution method, inverse matrix method and the commonly used average concentration method.
并将反褶积法的分层解释结果与逐次迭代法、逆矩阵法和平均含量法的解释结果作了对比。
The average breath-alcohol concentration reading for those who mixed alcohol and energy drinks was 0.109, well above the legal driving limit of 0.08.
混合饮用酒精和功能饮料者的平均酒精呼吸浓度是0.109，远高于法定驾车者的限定值0.08。
Nordhaus's preferred policy, for example, would stabilize the concentration of carbon dioxide in the atmosphere at a level about twice its preindustrial average.
比如诺德·豪斯所倾向的政策，将大气中的二氧化碳的浓度设定为前工业化时期平均值的两倍。
This map shows the average chlorophyll concentration in the global oceans from July 2002-may 2010.
这张地图显示了从2002年7月至2010年5月间全球海洋的平均叶绿素浓度。
The state’s concentration of Big Three workers is 12 times the national average, explains Mr Grimes.
Grimes先生说，三巨头在密歇根州的雇员总数是美国其它州平均人数的12倍。
From 1970 to 2000, the concentration rose by about 1.5ppm each year, but since 2000 it has risen to an average 2.1ppm.
从1970年到2000年，每年的浓度上升大约是1.5个百万分点，但从2000年起，这个平均值已经上升到了2.1个百万分点。
That is because, during daytime hours, the concentration of NO2 in those cities was, on average, about 20% lower on Sundays.
这是因为在这两个城市的白天时段，平均下来周日的二氧化氮浓度要低大约20%。
Average pollen concentration in the modern deposits is much less than those in surface soils on both the grassland and the cultivated land.
现代沉积旋回的孢粉平均浓度，远低于草地和坡耕地表土，这表明草地和坡耕地土壤不是沉积泥沙的主要来源。
The small average relative error of tracer concentration in the different range of researched gas flow capacity shows a better quenching effect of the new quench mixer.
在所研究的气体流量范围内，示踪剂浓度的平均相对偏差均较小，说明新型急冷混合器具有较好的混合效果。
By ensemble average method, the concentration distribution and error threshold of quasispecies on single peak Gaussian distributed fitness landscapes were evaluated.
利用系综平均的方法，计算了在单峰高斯分布适应面上准物种的浓度分布和误差阈。
The principle, method and case history how to predict the average uranium mass concentration in lixivium of in-situ leaching are introduced and the existing problems are discussed.
介绍了矿床采区浸出液中平均铀质量浓度的预测原理、方法和实例，并讨论了存在的问题。
Determine the concentration of acetate in the test solution using the calibration curve generated by the average of the readings obtained with the reference solutions.
由对照溶液的平均读数得到校正曲线，用该校正曲线测定供试液中醋酸盐的浓度。
DNA damage rate and the average migration distance of DNA were increased in a concentration dependent manner.
随着乙醇醛浓度的升高dna损伤率和DNA平均迁移距离均以浓度依赖方式增加。
The distribution of average aerosol concentration has an elliptic form and the direction of its major axis is NW-SE.
气溶胶平均浓度的分布呈椭圆形，长轴方向为西北—东南向。
Results The total compliance rate of dust is 86.35%, among them the average dust concentration in rolling plants is the lowest and in iron-smelting plants the highest.
结果武钢粉尘总合格率为86.35%，其中轧钢系统的平均粉尘浓度合格率最高，炼铁最低；
In addition, the influences of the parameters such as diameter, velocity and concentration of petroleum coke on the average coefficient of flow resistance were discussed.
此外，讨论了管内流速、管径大小和浓度对平均阻力系数的影响。
The influence of the different kinds of particles on the radial distribution with increasing the cross-sectional average solids concentration is different.
实验还发现，床层截面平均浓度的增加，浓相区内颗粒浓度的分布更均匀，而对稀相区内颗粒浓度分布没有明显的影响。
The average plasma urea concentration has decreased and its variation was more smooth after feeding the ration containing Starea than urea.
与尿素日粮相比，动物采食含糊化淀粉尿素日粮后外周血液尿素浓度有所下降，且动态变化也相对平稳。
The average diameter of nano fibers decreased with reducing ion concentration.
随着电纺溶液中离子浓度的降低，复合纤维的直径逐渐变小。
The average error of the leachate concentration is less than 6%, which is verified the model is reliable and practical.
淋滤液浓度拟合误差小于6%，从而验证了模型的可靠性和实用性。
The average error of the leachate concentration is less than 6%, which is verified the model is reliable and practical.
淋滤液浓度拟合误差小于6%，从而验证了模型的可靠性和实用性。
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