Air pollution in Beijing reached a high level of 99 on the Air pollution Index on Friday as a sandstorm from the northwest shrouded the capital in dust, the China News Service reported.
据中国新闻社报道，北京市区13日遭遇了来自西北方的沙尘袭击，当天该市污染指数一度达到99。
Dust removal rate is an important index to measure the function of waste gas pollution treatment facilities.
除尘效率是衡量废气污染源治理设备性能的重要指标。
Fly ash in flue gas not only crusts on the surface, stopping the dissolving of limestone, but also affects the dust discharge index, reducing the quality of gypsum.
烟气中的飞灰既在液相膜表面结壳，阻碍石灰石的溶解，又影响脱硫系统含尘量排放指标，降低石膏品质。
Objective To study on the change of the immunoglobulin and superoxide dismutase (SOD) level of the dust- exposed workers and seek for early diagnostic index of pneumoconiosis.
目的为了研究粉尘作业工人的免疫球蛋白和超氧化物歧化酶（SOD）的改变情况，探讨尘肺早期诊断的辅助指标。
According to national statistics, coal mines with coal dust explosion risks account for 60% of all coal mines, among which coal mines with explosion index over 45% accounting for 16.3%.
据统计全国煤矿中，具有煤尘爆炸危险的矿井占煤矿总数的60%以上，煤尘爆炸指数在45%以上的煤矿占16.3%。
Desert dust and particulate matter in the city had been known to force the pollution index into warning territory, above 300, which means people should stay indoors.
这座城市的沙尘和微粒污染指数达到300以上，这意味着人们必须待在家里。
For the limestone and SBS I-D asphalt mastic, the penetration index values also showed an optimum dust to binder ratio but with higher values than other mastics.
对于添加石灰石的SBS I - D沥青胶浆，其针入度指数同样表现一最佳矿粉结合料比，该比值高于其他胶浆的最佳矿粉结合料比。
The results showed that with the main air pollution in China being coal dust, the comprehensive air pollution index of Shenyang was the highest, Dalian the lowest and Zhengzhou in the middle.
结果显示我国大气污染属煤烟型，污染的综合指数以沈阳最高，郑州次之，大连最低。
Comparative analysis of air quality indexes between the year of 2006 and 2007 of Tieling is conducted including air quality comprehensive pollution index and PM10 and SO2 and NO2 and fall dust.
对铁岭市2006年和2007年的环境空气质量进行对比分析，其中包括大气质量综合污染指数、可吸入颗粒物、二氧化硫和二氧化氮、降尘等指标的统计分析。
Comparative analysis of air quality indexes between the year of 2006 and 2007 of Tieling is conducted including air quality comprehensive pollution index and PM10 and SO2 and NO2 and fall dust.
对铁岭市2006年和2007年的环境空气质量进行对比分析，其中包括大气质量综合污染指数、可吸入颗粒物、二氧化硫和二氧化氮、降尘等指标的统计分析。
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