| Atmospheric PAN was measured by online instrument at Guangdong Atmospheric Supersite of China, located in Heshan, in August 2012. The variation pattern and its influence factors were analyzed. During this measurement, the highest concentration of PAN was 4.654×10-9, indicating a moderate photochemical pollution in this area. The diurnal variation of PAN showed a typical unimodal pattern with a peak at 14:00—16:00, which is similar to that of O3. Besides, PAN was also related to NO and NO2 , with peaks appeared during time with low values of φ（NO）/φ（NO2） ratio. |
