SEZIONE DI GENOVA
Most of the light absorbing material is the result of soot from incomplete combustion, often termed black carbon or soot. Minerals in fugitive dust also have light absorbing properties, as do certain organic compounds formed from oxidation of directly emitted organic gases. The smoldering phase of biomass burning produces smoke with a variety of colors, including browns, yellows, and chartreuses that are distinctive from the black carbon associated with the biomass flaming phase and engine exhaust. The absorbance spectra, ranging from the near-UV to the near-IR (λ= ~300 to ~1000 nm) of suspended particulate matter (PM) is indicative of the sources, chemical composition, and radiative balance influence of the aerosol. Several instruments are now available to quantify absorption spectra at continuous and discrete wavelengths. Multiwavelength measurements are being added to U.S. speciation monitoring networks owing to their value in identifying potential sources and determining adverse effects.

DATA: 10-03-2016