Significant levels of p,p′-DDT, p,p′-DDE and p,p′-DDD in indoor air,
dust and outdoor soil were found up to 21 years after indoor spraying
in Oman. To the authors knowledge this is the first study in which the
cancer risk on human population was predicted years after DDT
spraying indoor in Oman. Results have shown that up to 16 years after
indoor spraying of DDT there is still a significant cancer risk for adults
and for young children. Region-specific half-lives showed to be important
for the risk assessment prediction. The novel approach can be
used for other locations and countries to predict prospective exposure
of contaminants based on indoor experimental measurements and
knowledge about the spraying time-schedule to extrapolate regionspecific
half-lives and predict effects on the human population years
after spraying. More attention should be paid to the long term consequences
of indoor spraying of DDT and alternative insecticides.