As a first step, the steady state background concentration of ambient air pollution levels is modeled.
2.1. Background PM concentration
An evaluation of the data from a literature review on the characterization of particulate Triapine in European ambient air results in a comprehensive list of size-segregated, chemically disclosed components for three different archetypal locations. The amounts of PM10 and PM2.5 are quoted as mass and for UFP as particle number concentration (Table 1). A complete list with all of the identified chemicals based on the literature review is provided in the Supplementary material (Chapter 2.1; Table S1).
Humbert el al. employed the concept of archetypal locations for PM in LCA (Humbert et al., 2011). The choice of the three archetypal locations in this study, rural, urban and curbside, is arbitrary. One could define other categories as well, e.g., industrial, residential, and remote. However, the suggested categories reflect a common attribution in LCA, and the terminology can easily be associated with population densities from exposure modeling (city center corresponds to curbside, high population density corresponds to urban, and low population density corresponds to rural).