It is a simple safety feature to install windows on the 20th or 120th floor which do not open, and on days when heat, humidity and smog combine to make city streets distinctly unpleasant, opening a window would provide anything but a breath of fresh air.
Another growing issue with indoor air quality is that of growing scent allergies among the population. More and more offices are fragrance-free for the comfort of those who become ill with over-exposure to perfumes-a hazard in any heavily populated building-with similar extant allergies to dust, pollen, mold and anything else that can become airborne and irritate the nasal passages.
The same issue applies to a daily increasing number of machines and fabrication processes. In the world of ever-smaller microchips, wires, and parts not yet imagined, building air quality is more important than it’s ever been. It is, therefore, imperative that air conditioning, heating and ventilation systems are kept in good repair.