城市空气质量水平是以空气质量指数(API)来表征的，API的时空变化可以反映城市空气质量的变化过程。
Urban air quality level is token by air quality index (API), whose spatiotemporal change can reflect the change of urban air quality.
这些将以现有的世卫组织室外空气质量指南以及最近出版的世卫组织关于特定室内污染物水平的指导意见为基础。
These build upon existing WHO outdoor air quality guidelines and recently published WHO guidance on levels of specific indoor pollutants.
天气预报表明，周三伴随着强风的来临空气质量将回归正常水平。
Weather forecasters say air quality will return to normal this Wednesday following forecasted strong wind.
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