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- Optical and chemical properties of atmospheric PM fractions related with air masses in the central Iberian PeninsulaPublication . Mogo, Sandra; Cachorro, Victoria; Sorribas, Mar; de Frutos, Ángel MFrom December 2003 to June 2004 approximately weekly aerosol samples were collected in Valladolid, Spain. Gravimetric measurements were performed on the four particulate matter fractions: TSP, PM10, PM2.5 and PM1. The samples were analyzed for major ions by ion-chromatography. The optical properties of the fine particles are studied through the absorption coefficients, σa, in the visible range and the spectral shape of σa was analyzed by deriving a parameter, αa, similar to the Ångström exponent used for the extinction. Aerosol properties are classified according to their dependence on air mass origin.