How easy is it to pollinated???

How easily do marijuana plants get pollinated?

I leave all my windows open for cooler temps and better air flow, is there any way that my plants could get pollinated from this?

your females will only pollinate if you have males present that have flowered long enough for their sacks to open. If you have males at that stage of development even in the same house (let alone the same room) then yes they can pollinate. The light fluffy powder-like pollen can travel with the wind over a mile in the outside.

Ok so I could pollinate my females just by having my window open???