Is growing outside near an indoor garden dangerous?

Is there any serious danger of 'cross-contamination' with outdoor plants negatively impacting nearby indoor grows because of:

-pests
-pathogens
-pollen?

I would imagine the main vector would be ventilation, as in bugs, spores and/or pollen coming in through the ventilation system.

what plants are you speaking off cannabis plants or garden plants?

and yes if you mean cannabis... pollen from male plants can transfer from you just like it does bee's.
Pest the same way if you have em out or inside you can if your not careful impact the other crow.. use lotsa ISO wipes and keep the area clean.