2.3. Processing and analysis of samples
The particles were collected on membranes filters, fiberglass Whatman 20 x 25 cm for the final filter and 10 x
12cm for filters of the levels of cascade. In order to determine the content of PM-i, the size of each floor filters are
weighed before and after collect at a precision of 0.1 mg.
The atmospheric concentration of PM-i was expressed in μg/m3.