@jultar2001 @StillMadGreek @twobluecats @DrEricDing @CDCgov Room air cleaners are not expensive in addition to or in place of fixed infrastructure improvements when the latter are not feasible or sufficient. At least for high income countries. $100 per year per person or less is easily achievable.
@jultar2001 @StillMadGreek @twobluecats @DrEricDing @CDCgov 当固定基础设施改进不可行或不充分时，除了或代替固定基础设施改进外，房间空气净化器并不昂贵。至少对于高收入国家而言。每人每年 100 美元或更少是很容易实现的。