No abstract

The composition of organic matter derived from PM2.5 fraction of urban aerosols collected in Saint-Petersburg during the annual cycle was investigated by 1 H NMR, 13 C NMR and IR spectroscopies. It was found that the composition of organic fraction varies slightly with the seasons. The main organic components of aerosol extracts are aliphatic oxygen-containing compounds (such as derivatives of carboxylic acids and esters), whose content is maximum in winter samples. Aromatic compounds are present in aerosol extracts in negligible quantities. The results showed a significant contribution of the process of combustion of automotive fuel in the formation of low molecular weight organic compounds that are present in the composition of urban aerosol.