Vertical Observations and Analysis of PM2.5, O3, and NOx at Beijing and Tianjin from Towers during Summer and Autumn 2006

During the period between 18 August and 22 September 2006,an ultraviolet photometric O 3 analyzer,a NO-NO 2-NO x chemiluminescence analyzer,and a quartz micro-oscillating-scale particle concentration analyzer were simultaneously used for monitoring at three different heights each at Beijing(325-m tower) and Tianjin(255-m tower).These towers belong to the Institute of Atmospheric Physics(IAP) of the Chinese Academy of Sciences(CAS) and to the Tianjin Municipal Meteorological Bureau,respectively.These measure...