How is fuel dumping safe?
Fuel dumping is almost always an emergency maneuver, and it is never good for the environment.  So the alleged danger from the dumping must be balanced with the imminent danger to the 200&ndash;400 passengers involved.  It is never an easy decision but that's why the Captain gets paid the big bucks...

Dumping fuel sounds dangerous but it is not.  It is not going to explode.  Jet-A can be compared to kerosene and I don't have that statistic so let's compare it to Diesel Fuel which is not dissimilar to Jet-A.  Diesel Fuel at 400&deg;F(204&deg;C) is as volatile as gasoline is at 70&deg;F(21&deg;C).  Obviously that is a big difference.  Jet-A also evaporates into the air, so little if any hits the ground.  

The biggest danger I see is to the atmosphere.