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New particle formation during the oxidation ofa- andb-pinene(C10H16) by ozone, OH and NO3 was studied by measuring the particle sizedistributions with a scanning mobility particle sizer (TSI 3936). The results indicate a drastically higher nucleation potential ofthe ozonolysis than in the reaction with either OH or NO3. On the contrary, the contribution of the individualoxidation reactions to form new aerosol volume was found to depend on the location of the carbon double bond to be oxidised: for theendocyclic a-pinene reactions the ozonolysiscontributed mostly to the aerosol volume yield, whereas for the exocyclic b-pinene reactions the oxidationby O3, OH and NO3 yielded a similar aerosol volume. In a second part of this study the influence of water vapour on the nucleation in all three possible oxidation routes wasexamined. The observations revealed only an effect of water vapour during the ozonolysis reactions

atmospheric chemistry and physics

New particle formation during &amp;lt;font face=&amp;quot;Symbol&amp;quot; &amp;gt;a&amp;lt;/font&amp;gt;- and &amp;lt;font face=&amp;quot;Symbol&amp;quot; &amp;gt;b&amp;lt;/font&amp;gt;-pinene oxidation by O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;, OH and NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;, and the influence of water vapour: particle size distribution studies