Even though this review focuses on particles of outdoor origin, mention should be made of other specific sources of fine and ultrafine particles which may be of interest.
Particulate matter inside Apsley House is mostly of outdoor origin, and therefore we expected to find a lower amount of the same chemical species.
In contrast, the cultivable airborne fungi did not show any correlation with the number of visitors, probably, due to their outdoor origin.
The results of this study contribute toward deeper understanding the degree of protection provided by the buildings from pollution of outdoor origin.
Generally speaking, indoor air cleaning control method requires less supply airflow rate than positive pressure control method for reducing the concentration of indoor particles with outdoor origin.
Our study is restricted to pollutants of outdoor origin, i.e. it does not incorporate intake in a microenvironment from direct emissions into that microenvironment.
Widespread economizer implementation, however, has been hindered by potential reliability concerns associated with exposing information technology equipment to particulate matter of outdoor origin.
In addition, the PM2.5 fraction in the PM10 mass is ranging from 0.7 to 0.9 in the sampling sites indicating also that particles indoors have a significant outdoor origin.
The 2 years average PM2.5 fraction in the PM10 mass is ranging from 0.9 to 0.74 in the indoor and outdoor sampling sites indicating also that particles indoors have a significant outdoor origin.
Therefore, predicting particle penetration into buildings could help to quantify the indoor exposure to particles with an outdoor origin and thus to develop effective strategies to remediate the exposure.
These findings indicate that economizer use combined with improved filtration could reduce data center energy demand while providing a level of protection from particles of outdoor origin similar to that observed with conventional design.
