@nedbh @DickZoutman @sdbaral Read the list again. China uses mostly surgical masks not respirators and hasn't done much about indoor air quality, certainly not comprehensively.
@nedbh@DickZoutman@sdbaral再次阅读列表。中国主要使用外科口罩，而不是呼吸器，在室内空气质量方面也做得不多，当然也不全面。