And these secondary pollutants of mineral reagents can enlarge the scale of pollution, and increase the complexity of pollution.

且这些二次污染物有的进一步交叉、作用，使矿山药剂的二次污染链延伸。

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There have been few epidemiological studies to validate such claims, but the scale of such reports highlights the growing fear of pollution.

目前还没有流行病学研究对这些说法进行认证，但是大量的报导加剧了人们对污染的恐惧。

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Based on the scale of current urban residential and the importance of indoor air quality at homes, the problem of indoor air pollution of four cities in China was studied in this paper.

本论文从目前中国城市住宅的规模和住宅室内空气品质的重要性出发，对中国四城市的住宅室内空气污染问题进行研究。

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If economic incentives facing producers and consumers do not change with higher incomes, pollution will continue to grow unabated with the growing scale of economic activity.

ECONOMIST: Local difficulties

The environment has moved to the top of their political agenda, and they have promised increased environmental investment, set impressive targets for reducing pollution and launched grand-scale campaigns to address particularly challenging problems of environmental degradation.

CNN: Economic miracle, environmental disaster

Air Pollution Score rates tailpipe emissions for pollutants that cause smog, on a scale of 1 to 10, with 10 being the cleanest and 1 the dirtiest.

FORBES: America's Dirtiest Vehicles 2013