Biogenic VOCs emissions and its impact on ozone formation in major cities of China

A measurement campaign was performed in two large cities in China, Beijing and Guangzhou, to investigate biogenic emissions of volatile organic compou nds (VOCs) using a GC-FID system and the enclosure chamber technique. Four typical types of trees, namely pine, cypress, poplar and Chinese-scholar tr ee were studied. The influences of temperature and light intensity on VOC e missions were analyzed using algorithms derived from what is currently unde rstood about VOC emission mechanisms. Biogenic VOC emission fluxes in these two cities were estimated. A 2-D air quality model was developed to assess the role of biogenic VOC emissions in the ground-level ozone formation in Beijing and Guangzhou.