ANSI/AARST MALB-2014修订版。1-21规定了用于住宅、非住宅或混合用途的共用构筑物或部分共用构筑物的氡浓度测量程序和最低要求，以确定是否有必要采取氡缓解措施来保护当前和未来的居住者。1-21本出版物的修订版包括对大多数条款的协调，以便在ANSI/AARST MAMF和ANSI/AARST MALB中阅读相同的内容。

ANSI/AARST MALB-2014 rev.1-21 specifies procedures and minimum requirements when measuring radon concentrations in shared structures, or portions of shared structures, used for residential, non-residential or mixed use purposes to determine if radon mitigation is necessary to protect current and future occupants. 1-21 revisions to this publication include harmonization of most provisions to read the same across both ANSI/AARST MAMF and ANSI/AARST MALB.