I think Arsenal have very little chance. PSG is playing better than Arsenal this year and I think PSG will make it to the final.
I think Arsenal will not be able to do anything in the second leg and will be eliminated.
PSG will focus on the Inter - Barcelona result tonight.
Arsenal's chance is still big enough to get into the final as they lose only one goal in the aggregate. The only problem is that their gameplay is not even equal to the PSG. They're one of big club in PL, but first leg told us a lot about how they is not that solid compared to their opponent.
The pressure to them is just getting bigger as they play away soon. This raises my doubt to believe them can pass it. Their odds 3.46 is literally small, and there is only slightly gap to PSG 2.14. However, i think it doesn't matter, and PSG seems to win the game soon.