Subject: What would be the effect of a large influx of electrons into a closed area?

I seem to be very confused about the way electrons behave. When they're very 
energetic, they're called ionising radiation. But what if they don't have these 
levels of energy? Since moving electric charge creates magnetic field, 
presumably there would be magnetic effects? Where would the electrons end up? 
Would they ionise the atoms in the air? Would they create some kind of plasma? 
Would there be static electricity effects? I don't know the source of these 
electrons, except that it's not ordinary. One thought was Hawking radiation 
from a lot of evaporating micro black holes!?? (Although that would presumably 
produce a lot of light and other particles too...) The area is an ordinary air 
filled seminar room, surrounded by brick, plaster, paint, glass, wood/metal/
leather furniture... Suppose this flow of electrons just keeps coming... would 
it start to become a problem?

Re: What would be the effect of a large influx of electrons into a closed area?