Surface ozone concentrations and solar radiation in polluted and remote areas in Egypt

this work discusses sources of ozone in the troposphere, particularly with regard to the relative contributions of flues from the stratosphere and that created due to photochemical reactions in the troposphere. Measurements of surface ozone at cairo and the oases Dakhla are used as a a comparative study between the formation of ozone in a polluted area and that of clean atmosphere. The daily maximum ozone concentrations found to be 105 ppb in cairo and 52 ppb in Dakhla. The results show that the budget of ozone in the polluted air masses is dominated by photochemistry, and there is a significant correlation between the monthly mean value use of ozone and global radiation. The ozone budget in free troposphere and rural areas, where the diurnal variation is very low compared to that of polluted areas, is governed by vertical transport