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减少废气
environ.	réduction des émissions d'effluents gazeux (通过采用清洁技术、有效运用操作过程、改善燃料质量和为确保气体的扩散而使用足够高的烟囱，使得从机动车、工业和采暖设备等排放到大气中的气体排放量减少。)