《Table 5–Variation in particle number concentration induced by oxidation (sulfur dioxide) .》

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《Potential factors and mechanism of particulate matters explosive increase induced by free radicals oxidation》

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Sulfur dioxide is an important atmospheric pollutant that causes acid rain and generates sulfate；to some extent，it directly damages the ecosystem and threatens the survival of humanity.As a certain amount of SO2was emitted in the smog chamber，the PNC produced two peak values with ozone，as shown in Table 5.During the initial stage of the reaction，the PNC decreased over time and then gradually increased until the highest value emerged.From then on，the PNC slowly decreased to near the background level because the chain reaction was terminated and energy was lost.These results indicate that a significant amount of time is needed to nucleate and accumulate large amounts of ultrafine particles before particulate matter explosive increase occurred.We attributed the first peak to the high concentration of ozone，which triggered new particle formation.By contrast，the second peak resulted from long-term accumulation because the half-life of ozone is only0.5 hr.Unfortunately，the ultrafine particle size was below the instrument detection limit.However，SO2has been proven to play a considerable role in the formation of particulate matter and should attract more attention in the future.