الفهرس 
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Abstract
The object of this investigation is to assess primary
pollutants, their concentration and to study the role of
meteorological factors on the formation of photochemical reactions
in urban atmosphere and the determination of the levels of
secondary pollutants such as ozone, oxidants, smog, sulphates,
nitrates and nitrites in Cairo City, In addition to lthe impact
assessment of the accumulation of these pollutants on materials as
a reference for comparison-
This takes place through the following :
I - Determination of surface ozone and total oxidant levels, their
seasonal and diurnal variations.
2- Estimating the relation between surface ozone concentrations
and the concentration of some gaseous pollutants such as N02,
NO.
3- Investigating the photochemical reactions which may take
place in this atmosphere.
4- Studying the particulate matter concentrations ·in both forms,
dustfall and total suspended dust and their chemical composition.
5- Evaluating of heavy metals levels.
6- Studying the effects of meteorological factors on the
concentrations of particulate matter and gaseous pollutants.
7- Studying the impact of these pollutants and their accumulation
on materials exposed in different areas.
8- Suggesting possible ways or means to abate or minimize air
pollution in Cairo.