Differentiation of the exposure to PM (particulate matter less than 2.5 μm in aerodynamic diameter), NO and O i.e. pollutants of outdoor origin, due to the occupation of office and school microenvironments, was investigated through the quantification of the respective Indoor to Outdoor (I/O) ratios, in simple statistical terms. For that cause, indoor and outdoor observation data were retrieved from the HEALS EDMS database, and more specifically the data from the OFFICAIR and the SINPHONIE EU projects. The I/O ratios were produced and were statistically analyzed in order to be able to study the influence of the indoor environment against the pollutants coming from outdoors. The present statistical approach highlighted also the differences of I/O ratios between the two studied microenvironments for each pollutant. For exposure estimation to the above-mentioned pollutants, the probability and cumulative distribution function (pdf/cdf) empirical approximations led to the conclusion that for offices the I/O ratios of PM follow a normal distribution, while NO and O a gamma distribution. Respectively, for schools the I/O ratios of all pollutants follow a lognormal distribution.

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http://dx.doi.org/10.1016/j.envres.2019.108791DOI Listing

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