Particulate matter (PM), also being referred to as particles and aerosols, are present in the air we breathe in different microenvironments, including indoors and outdoors. The sum of all PM we inhale in different microenvironments constitutes our total PM inhalation exposure. To identify the microenvironments contributing the most to the cumulative exposure, we must quantify both the time spent in a microenvironment and the PM concentrations in that microenvironment. Previous studies have reported that people spend about 90% of time indoors and pollutants from an indoor source can be trapped for an extended time owing to tightening building envelopes.

 

 

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