I'm not entirely sure what the legal limit is where I live. The airsoft fields here mostly use these limits:

Indoors/Close quarters - 1.14j
Outdoors - 1.49j

With the higher velocity, there are rules limiting how close you can shoot someone. If someone is too close, you have to say "safety" or "bang" instead of shooting.

I'm very new to airsoft, so this is stuff I've been discovering recently.