When we use our washer air bubles come up through the toilet the washer has an air vent by the p-trap what can I do as this lets smell in p.s. its in the basement.

You have a partial clog in the drainage line that services toilet. Let me explain what's happening. You flush the john, The discharge picks up speed and bangs into the partial clog in the line and starts to rebound back pushing a bubble of air ahead of it. This is what you see in your toilet. Then, because it's not completely blocked the discharge drains away before anything overflows. This can only get worse. The drainage line that services the toilet needs to be snaked out from the lavatory roof vent or if you're on a septic tank it should be checked to see if it needs to be pumped.
Good luck, Tom