respirable
/ˈrespərəbl/adjective
1- (of the air or a gas) able or fit to be breathed（空气或气体）能被呼吸的; 适于呼吸的。
1.1
- (of particles in the air) able to be breathed in（空气中的粒子）能被人体吸入的：
woodworking can create quantities of fine respirable dust.
木器加工能产生许多细小且能被人体吸入的粉尘。
词源
late 18th cent.: from French respirable or late Latin respirabilis, from respirare 'breathe out' （see RESPIRE）.