This regulation prescribes the concentrations of benzene, toluene and dimethylbenzene in air forresidential area by gas chromatograph method.
This regulation prescribes the concentrations of benzene, toluene and dimethylbenzene in air forresidential area by gas chromatograph method.
本标准规定了用气相色谱法测定居住区大气中苯、甲苯和二甲苯的浓度。