Since the last Quarterly Report the air resources program has concentrated on the review of data collected by the 100 foot tower since December 1980. As mentioned in the last Quarterly Report, there have been periods of excessive data loss, the causes for these losses have been periods of excessive data loss, the causes for these losses have been traced to one of two areas which have been outlined below in the Data Recovery section. The remainder of this report contains an analysis of the data collected between December 1980 and September 1981. Finally, the calibration report filed for the August field calibration is presented in Appendix A.