What steps can one take to protect themselves as AQI turns unhealthy?
As AQI (Air Quality Index) turns unhealthy, try to stay indoors as much as possible and use a HEPA-filter air purifier inside home to reduce PM2.5 and other toxins. Wear a well-fitted N95/N99 mask while going out to filter fine particles. Avoid going outside during peak or rush hours and strictly avoid smoking indoors to avoid indoor air pollutants.