世界卫生组织说，导致高污染水平的原因各有不同，不过通常是由迅速工业化及在交通和发电上使用低质量的燃料导致的。
WHO said the reasons for the high pollution levels varied, but that often rapid industrialization and the use of poor quality fuels for transportation and electricity generation are to blame.
世界卫生组织说，导致高污染水平的原因各有不同，不过通常是由迅速工业化及在交通和发电上使用低质量的燃料导致的。
WHO said the reasons for the high pollution levels varied, but that often rapid industrialization and the use of poor quality fuels for transportation and electricity generation are to blame.
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