First of all, I'd like to touch on the background of this study.

As you know well, persistent organic pollutants (POPs) representing polychlorinated dibenzo-p-dioxins, dibenzofurans, PCBs, and organochlorine insecticides are lipophilic stable contaminants.

They have been detected in a wide range of environmental media and biota, and have been of great concern on their toxic effect on humans and wildlife.

In developed countries, comprehensive investigations on the POPs pollution have been documented well, and made clear that environmental residue levels have been decreasing in recent past decades.

However, in developing countries, fewer information are available on the pollution of these contaminants, particularly dioxins and its related compounds.

Dumping Site in India
 
This is a same view in India.
 
Large scale dumping of municipal wastes is common in the urban regions of many developing countries.
 
Variety of wastes including plastics, metals, papers, woods and raw materials are dumped in large open land areas.

Burning of Dumps
 
The major problem here is burning of wastes at low temperatures due to the generation of methane gas.
 
As you guess now, the burning of wastes forms dioxins.

Dumping sites of municipal wastes in Asian developing countries may be expected as the sites of secondary formation of dioxins and related compounds, because huge amounts of various wastes have been dumped daily and continuously burned under low temperature by spontaneous combustion or intentional incineration.

Also, the usage of organochlorine insecticides at these sites for public health purposes is unavoidable, because of serious hygenic problems in dumping sites.

Therefore, it is suspected that pollution sources are present in dumping sites, and many residents around there might be exposed to these contaminants.