Sulfate sources in carbonaceous aerosol particles in urban atmosphere (on the example of Irkutsk)

According to the monitoring data, it was found that the main source of sulfates in carbonaceous particles in the atmosphere of Irkutsk is sulfur dioxide captured from the air. Their accumulation in the particles is caused by heterogeneous chemical reactions (GHR) and is accompanied by the replacement of hydrocarbonates (HCO3 –) with sulfate anions. In this case, sulfur dioxide is oxidized by ozone in the dry atmosphere, and hydrogen peroxide (H2O2) also participates in the humid, along with dissolved ozone, during the oxidation of sulfur dioxide. The details of the mechanisms of these GHR are discussed and estimates of the dynamics of the sulphate production in carbonaceous particles are given.