Monitoring of ambient BTX at Monterotondo (Rome) and indoor-outdoor evaluation in school and domestic sites

Results from a five month monitoring campaign of BTX (benzene, toluene and the sum of ethyl benzene, o-xylene, m-X-ylene and p-xylene), performed at Monterotondo a little town 23 kin NE of. Rome, and correlation of the measured: concentrations with meteorological and natural radioactivity data are presented and discussed. This campaign allowed us to extrapolate a pattern of the annual distribution of benzene in the town. A map, showing the average distribution of pollutants, is-presented, as a useful tool to manage an appropriate policy-of air pollution. A contemporary indoor-outdoor investigation has been. performed at five homes and two classrooms,of Monterotondo and at thirteen homes and. thirteen classrooms in the outskirts of Rome.; Non-smoking people and low polluted sites were chosen for this campaign, in order to highlight if commonly used domestic materials could act as internal sources. Data, obtained by employing long-term diffusive samplers, are compared with a parallel experiment showing the day-night indoor-outdoor trend. The obtained, results, confirmed through statistical, analysis of data, let us conclude that there is evidence of internal sources at homes whilst, in the schools, depletion, phenomena prevail, probably due to the walls adsorption.