FYI,
The air circulation on the A380 goes from cabin, to cargo , then overboard. No chance of fumes from the cargo entering the cabin.
The A380 is certified to land over weight. Depending on the rate of desent at touchdown will depend on the post landing maintenance check.
The A380 PCN ( pavement calcification number) is not the restricting quantity. its the fact that the beast is almost 80m x 80 m. Most airports have not planned for this as such obstacle clearance for take off , taxi and parking is comprised.
In an emergency the A380 can land at any airport ( assuming enough LDA ).. land yes, takeoff again... well possible not.
From my point of view, i get it on the ground, what happens next, is not my problem. Remote parking and air stairs work very well as I have observed. If parked in an open area then no need for a tow bar also .