Indoor Air Quality

Studies have shown that people spend up to 90% of the day indoors. As a result, indoor pollution levels can be 100 times higher than outdoor levels.

The dust in offices is made up of particles from various sources, including soil, pollen, hair, clothing fibres and dead skin cells. When someone inhales, dust in the air enters the nose, at which point most of the larger particles (bigger than 10 micrometres in diameter) are filtered, or are expelled by sneezing.

However, some smaller particles (typically between 2.5 and 10 micrometres, referred to as PM10 particles) always make their way into the windpipe and airways.