Can indoor air be a health risk?

Can indoor air be a health risk? - As World Health Organization (WHO) highlights in their guidelines for indoor air quality, people spend a considerable amount of time indoors, either at work or at home, indoor air quality plays a significant part in their general state of health. This is particularly true for children, elderly people and other vulnerable groups. - What you cannot see can hurt you. The smaller an airborne particle is, the more dangerous it is to your health.