The problem with He3* is that even though no "particle" radiation is released, the energy released is in the form of gamma rays. Eventually, the whole reactor gets hot and has to be disposed of properly. Similar to the faulty logic of claiming that electric cars are "clean". The pollution is just one step removed.

* Aside from:
1) Finding it.
2) Making any fusion reaction actually work!

__________________
Any day you wake up on "the right side of the dirt" is a good day.

T. Anderson