Department of Statistics, UCLA

Data collected between February 2006 and February 2007 with an O3 and PM-2.5 monitor in Lebec, California are analyzed. Extensive analysis is not possible, because of the short timespan, but we give descriptive statistics, mostly as plots. The influence of wildfires on PM2:5 and of I-5 truck traffic is discussed briefly. It is noted that there are two schools in close vicinity. In order to get more information about longterm developments, including prediction, more extensive and systematic monitoring is necessary.