SLIDE 8 Specific Causes of I ndoor Air Quality Specific Causes of I ndoor Air Quality Related Problems Related Problems
Cause of Problem Cause of Problem % of Times % of Times
Ventilation Ventilation 36% 36% Thermal Control Thermal Control 19% 19% Ventilation I nfiltration Ventilation I nfiltration 10% 10% Cross Cross-
contamination 11% 11% I ndoor Sources I ndoor Sources 9% 9% Microbial Contamination Microbial Contamination 7% 7% Site I nfiltration Site I nfiltration 2% 2% Undetermined Cause Undetermined Cause 6% 6%
* Source: I AQ I nvestigations conducted since 1981 by Theodor * Source: I AQ I nvestigations conducted since 1981 by Theodor Sterling Associates Ltd. Sterling Associates Ltd.