Izputra, u r correct, there are activated carbon on the filter, and it does help to remove certain % of smells.
It normally binds well with those organic chemicals (except a few) and less effective with inorganics.
But, if you use the external air circulation like our bro here, chances of removing the smells are low, as the external air flow into the cabin is faster than the adsorption rate of the activated carbon, the longer the air is retained with the activated carbon, higher chances of adsorption...............just my 2 cents.

Anyway, activated carbon does not adsorb CO.

2.48% very good rate, for how many years?

No, u need to press the black thing on the door handle to lock and unlock (SX only)

However, if u unlock and do not open any of the doors, it will lock back within 30 seconds.

errr....so you automatically lock is which one?
i) the one auto lock after 30 seconds if u didn't open the doors

or

ii) auto lock once u r away from your car at certain distance, reagrdless u open or do not open the doors.

if u open any doors/boot/bonet after u unlock, it will not auto lock back even after 365 days
so, make sure u lock your car properly.

I have no answer for this as I am not expert, just a typical car user (I do know some cars, the procedure is to wait till the airbaglight turn off before starting the engine).
I start the car using the 1st method, my car already 1 year.
Another bro here, Izputra, he mentioned he uses method 1 and his car already 2 years.
I believed either way is OK.

But if you are worry, then u can use the 2nd method to start the car.