Debris

Debris includes not only high level of radiation which is average 221 becquerels  but also such harmful substances as asbestos, arsenic, hexavalent chromium and  polychlorinated biphenyl.  It is unknown for us to see how risky the burning of debris is.

Experimental..which has two meaning. One is if the burning do harm to environment and human, all news says there were no rise of radiation at any point. So the answer of this question is already fixed.

The other meaning is much more important.   Residents must acquire some tolerence in their body by putting small amount of harmful substances as well as radioactive dust in order to prepare for the constant incineration over one year.

And also gives those who don't want to be exposed by any amount of negative factors the chance and time to move from the spot.