admissible concentration meaning in English

容许浓度

So the nation has come on a series of related standards . the emended national code for design of heating , ventilation and air conditioning ( gb50019 - 2003 ) requests the admissible concentration should be under 0 . 15mg / m3 . but the existing air conditioning system has no the set to purify the particle at all or the air purifying system is very simple that can not work
为此国家相继出台了有关标准，正在修订的国家标准gb50019 ? 2003 《采暖通风与空气调节设计规范》对各类环境空气污染物提出了限值要求，其中可吸入颗粒物( pm _ ( 10 ) )的允许浓度要求小于0 . 15mg m ~ 3 。