Author: Antonio Da Roza Date: 12/8/10

There was no significant correlation between levels of pollutant in indoor air with outdoor air except for respirable suspended particulates, with indoor air at a lower level as dust was trapped by filters in the ventilation system. [1]

Pollutants which showed higher levels indoor from outdoor had indoor emission sources, such as carbon dioxide, carbon monoxide, formaldehyde, volatile organic compounds, radon as well as bacteria and fungal counts. [1]

Controlling the indoor air quality which can therefore effectively reduce exposure of occupants in an indoor environment. [1]


  1. 1.0 1.1 1.2 ‘Consultancy Study on Indoor Air Pollution in Offices and Public Places in Hong’ Kong, 1997, D. Ng, Lai W.Y. and S. Liao, EHS Consultants Ltd