这份新报告不包括2002年以来的空气质量的变化。
The new report does not account for changes in air quality since 2002.
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.
还排除了更广的空气质量的变化，但即使在污染程度较低的地区，居住在主要高速公路附近的儿童的健康更易受到危协。
Also factored out were broader variations in air quality, but "even in an area with low regional pollution, children living near a major roadway are a increased risk of health effects."
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