The objective of finding the lidar configuration which best matches airshed pollution modeling guided this study. This study detd. which and how many wavelengths (more than the min. no. of 2 could possibly improve measurement accuracy) are the most suited for airshed modeling. Only Raman cell-based emitting systems were considered. The optimization process was performed via a computer simulation of the DIAL (differential absorption lidar) instrument and of representative atm. situations. This simulation certainly does not account for all crit. issues of a field DIAL O3 measurement, but it intends to point out some general principles of importance when making the choice of operating wavelengths.