This the cause of the red glow you are seeing in the sky tonight.
Pasir Gudang flaring.
It is very faint in the video, but you can feel the slight rumbling and hear the faint roar of the fire in person.
It's not that loud or big tonight, but when it is on full blast, we can feel the rumbling on our windows over here.
Things like this make me realize how physically close we are to Malaysia.
On a side note, this thing is reason why Punggol and Sengkang residents tend to ask, "Got haze meh?" when the rest of the island is complaining about haze.