The World Health Organization study on urban air quality says those most affected live in the world's poorest cities.
世界卫生组织对城市空气质量的研究指出，受影响最严重的是全球最贫穷城市的居民。
Thee world Health Organization study on urban air quality says those most affected live in the world's poorest cities.
世界卫生组织对城市空气质量的研究指出，受影响最严重的是全球最贫穷城市的居民。
Thee world Health Organization study on urban air quality says those most affected live in the world's poorest cities.
世界卫生组织对城市空气质量的研究指出，受影响最严重的是全球最贫穷城市的居民。
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