Analyzing atmospheric pollution episodes, which generally include increases in both ozone and fine particle matter, provides a means of describing the evolution of pollution events and examining influences of local meteorology on the particle and chemistry distributions in the lower atmosphere.  Measurements of ozone, water vapor, temperature, and extinction were obtained during the EPA sponsored, NARSTO-NE-OPS project using the Lidar Atmospheric Profile Sensor (LAPS) instrument, which was developed as a prototype for the U.S. Navy.  Results from the August 1998 pilot study of the project are presented.  The LAPS lidar instrument uses multi-channel photon counting detection to measure several wavelengths of Raman scattered signals which provide vertical profiles of atmospheric properties.  The formation of both aerosol particles and ozone is greatly influenced by regional and local meteorological factors, which control the development and dissipation of pollution events.  The investigations have shown the importance of vertical mixing, horizontal transport, and storage of precursor and pollutant matter in the residual boundary layer overnight.  An example atmospheric episode that depicts increases in both ozone and aerosol levels will be used as a reference to investigate conditions for meteorological control of the ground level concentrations and population exposure to both ozone and aerosol/particulate matter.  High concentrations of particles affect the optical properties of the atmosphere and have been correlated with increases in morbidity and mortality rates.  Measurements were made in the Philadelphia urban environment, where there is a combination of local sources, as well as contributions from long range transport of distant source regions.  Water vapor profiles provide a tracer of the boundary layer dynamics which is important in describing the distribution of ozone and particulate matter in the lower atmosphere.  Species distribution and local mixing rate have been found to be of major importance in determining the surface layer concentrations of air pollution components.