It can mingle with urban pollution and boost air quality to unhealthy levels in cities.
它与城市污染物相混合,使城市的空气质量降至危险等级.
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We set assessment index control of urban pollution, strengthen environmental protection organization and get practical effects.
区镇、街道城考指标设置后, 关系理顺了,工作科学规范、切合实际、环保机构得到了加强.
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