Monitoring of troposphere ozone in the peri- urban area of Oujda city in the east of Morocco

In the border city of oujda (moroccan-algerian border /east of morocco),and in order to monitor the tropospheric ozone (o3) levels,two sampling campaign of stratospheric ozone have been carried between 04/2013 and 01/ 2014 out on an hourly base with the use of an automatic ozone analyzer device using the uv absorption technology. this article provides o3 results to incorporate into reports and research studies. the monitoring of o3 levels in the ambient air of oujda during warm and the cold seasons respectively is needed,justified,discussed and interpret the o3 measurements. during the warm season 60.07% of the recorded values are below the moroccan limits and 41.1% are below world health organization limits,in the second sampling campaign (in cold season) 92% of the recorded values are below the moroccan limits and 84.6% are below world health organization limits. this article provides background information on o3 formation,sources,and a comprehensive review of probable o3 impacts and also describes the monitoring of o3.