Poor IAQ leads to short-term or long-term health issues, which reduces productivity and creates additional stress in a world where it is already enough.
Common symptoms associated with poor indoor air quality are:
eye, nose, and throat irritation, headache, nausea, dizziness, and fatigue. In some cases, a high level of air pollution worsens the condition of the tenant/worker and exacerbates the existing respiratory diseases, turning them into a chronic one: asthma, lung cancer, pneumonia, systemic hypertension, chronic obstructive pulmonary disease (COPD).
Indoor air quality is generally considered to be worse than outdoor air quality, especially when considering how much time people spend indoors.