“清洁空气技术指令”的简称；（德国）联邦排放控制法中的行政法规。TD Air包含例如某些污染物排放的限值，并定义了170多种物质的排放限值。
Short form for "Technical Directive on Clean Air"; administrative regulations in the context of the (German) Federal Emission Control Act. TD Air contains, for example, limit values for certain emission of pollutants and defines emission limit values for more than 170 substances.
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