coal dust index 煤尘指数
cumulative dust index 接触粉尘累积值
sand-dust index 沙区的沙尘指数
explosive index of coal dust 煤尘爆炸指数
dust harm index 尘害评价
dust-veil index 尘幕指数
Dust identified index 沙尘判识指数
Dust Concentration Index 沙尘浓度指数
comparable dust intensity index 可比沙尘强度指数
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。
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