What early warning signs indicate deteriorating indoor air quality in offices or factories?

Early warning signs of poor indoor air quality are often subtle and easy to dismiss at first. In offices, these might include increased reports of headaches, dry eyes, sore throats, or general fatigue, especially as the day goes on. If people feel noticeably better after leaving the building, that’s often a clue.

Unusual or persistent odours are another red flag. Musty smells may suggest damp or mould, while chemical or “stale” smells can point to poor ventilation. In factories, dust settling more quickly than usual or visible haze in the air should never be ignored.

Environmental indicators matter too. High humidity, condensation on windows, or rooms that feel stuffy despite ventilation running can all signal underlying problems. Rising carbon dioxide levels, if monitored, often indicate insufficient fresh air for the number of occupants.

Taken individually, these signs might not seem serious. But when patterns emerge, it’s usually worth investigating before conditions worsen.