空气质量的区域性评估 area assessment of air quality
一套新的空气质量评估体系拟把PM 2.5检测值纳入其中。PM 2.5是造成天气阴霾，并能损害人体呼吸系统的微小空气污染物。
A new set of air-quality evaluation standards under discussion is likely to include readings of PM2.5, the tiny airborne pollutants that cause haze and can damage the human respiratory system.
但我们却没办法收集到足够多的数据以评估某个特定街区的空气质量，而且这类数据非常难找。
There is not enough data that gets gathered to evaluate air quality in a given neighborhood and that data is hard to find.
卫星观测站还肩负着其他七颗卫星的环境数据收集工作，用以研究自然灾害，空气质量，土地评估以及传染病研究，NASA表示。
The satellite observatory is carrying seven additional instruments to collect a range of environmental data for studies of natural hazards, air quality, land processes and epidemiology, NASA said.
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