the recommended limits are time-weighted average of 200 mt during the working day for occupational exposure, with a ceiling value of 2 t.
建议的限值是在工作日中职业暴露为200mt的时量平均值,最高限值为2t。
carbon filters 89000-124 , -126 , and -128 are sold separately and keep concentrations of these chemicals below osha-recommended, time-weighted average levels.