Highly oxygenated organic molecules (HOM) from ozonolysis and photolysis of monoterpene can irreversible contribute to particle formation and growth. As the same as ozone, nitrate radical and chlorine atom play important roles during nighttime and early morning atmospheric oxidation process of volatile organic compounds. Here, we conducted chamber experiments to investigate HOM formation from oxidation of alpha-pinene, beta-pinene, delt-3-carene and D-limonene by nitrate radical and chlorine atom, respectively. Firstly, we will show detailed chemical characteristics of HOMs from oxidation of beta-pinene, delt-3carene and D-limonene, some important compounds identified in the chamber can be found in the boreal forest. Then, we will show the  increased concentration of nitrate radical impact ozonolysis of monoterpene process. Finally, we will try to quantify these perturbations by calculating the yields of HOM from four monoterpenes, atmospheric implications of our results will also be discussed.       
 

Monoterpene, HOM,chlorine atom, nitrate radical