The scope of studies of environmental pollutant in Egypt (and likewise in other developing countries) may be vast. However, to put our hands on the domain of the problem, I chose to refer to the report set by PRIDE in 1994 about the environmental risks in our Country and review the international literature in its own respect. According to this report, the relative health risks from environmental problems in greater Cairo, as an example is categorised as follows:

HIGHER RISKS
Particulate Matter Air Pollution
Lead (in all media)
Microbiological Disease from environmental causes
MIDDLE RISKS
Microbial Food Contamination
Ozone Air Pollution
MIDDLE/LOWER RISKS
Sulphur Dioxide Air Pollution
Carbon Monoxide Air Pollution
Indoor Air Pollution
Drinking Water Contamination by Chemicals
Drinking Water Contamination by Microbiological Agents
Solid and Hazardous Wastes.
LOWER RISKS
Toxic air Pollutants
Other water Pathways: Direct Contact, irrigation, fish consumption

UNCERTAIN RISKS
Nitrogen Oxides Air Pollution
Metals in Foods
Pesticides in Foods (middle risk if available data are accurate; lesser risk if not).