环保专家称，农场燃烧秸秆时生成的烟雾为印度首都最严重的空气污染贡献了四分之一的污染物。
Smoke from the farm fires contributed about one quarter of the levels of the most dangerous air pollution in the Indian capital, environmental experts said.
地球上的大气自然的受到沙尘暴和火山喷发的尘埃和气体的污染。但是最严重的空气污染确实人为的。
The earth's atmosphere is polluted naturally by sandstorms and the dust and gases from volcanoes. but the most serious kind of air pollution comes from people.
状况并不乐观。煤堆靠著北京的餐厅墙壁，提醒了我们中国最严重的空气污染成因。(环境健康观察)。
Odds stacked against them. Coal briquettes stacked against a restaurant in Beijing are a reminder of the cause of China's worst air pollution. (Environmental Health Perspectives.)
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