Technology Business News - Poor indoor air quality can be defined by high levels of pollutants in the air, such as dust, mould, toxic chemicals and viruses. Any one of these factors can exacerbate health problems, including asthma, allergies and chronic obstructive pulmonary disease COPD . There s also the increased risk of catching air-borne diseases such as Covid-19. By improving indoor air quality, people may find that these health problems are eased.