The outdoor air pollution is most common in low-income, urban areas and is caused by vehicle emissions, heavy use of fossil fuels, dust and burning of waste, the report said.
报告指出，室外空气污染由汽车尾气排放、大量使用化石燃料、粉尘和焚烧垃圾引起，在低收入的城市地区最为常见。
To mitigate the urban heat island effect, developers are also required to take account of air ventilation in urban areas.
为了减轻城市热岛效应，开发商还必须在市区内考虑空气流通状况。
More than 80% of people living in urban areas are exposed to unsafe air quality, according to a report released by the World Health Organization Thursday.
世界卫生组织星期四发表的一份报告说，80%以上的城镇地区居民呼吸的空气不安全。
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