so far does not encounter any chemical smell caused by the factory. the chimney of the nearby factory will release smoke during night, but so far does not sniff any bad smell caused by the smoke they released

the bad smell from toilet came after some time i stayed, i think after 3 weeks or 1 month.

as long as the defect u complaint is not affected/caused by the reno, grouting will still help to fix the problem. they are very helpful, jus i think mayb there is a lot of units and they don have enough workers so make the things slow.