Improving Air Quality To Improve Biological Immunity to Upper Respiratory Hazards

Aight! Got a story for yall. We suffer many respiratory illnesses more severely due to Nitrogen Dioxide and Sulfur Dioxide. Dr.s hands are tied right now but has anyone ever used a humidifier or dehumidifier for illnesses in their household?? If we all use air purifiers and humidifiers/dehumidifiers according to need of air quality in our homes we are going to have a better fate with upper respiratory illnesses because our lungs wont be suppressed by the air quality and our immunity will improve.