On the 20th of October 2020, a catastrophic incident has occurred in Penang. The incident that happened was a steel factory that is located in Penang exploded and produced a huge cloud of dark smoke.
https://youtu.be/ku5F1N3KiXw
The huge cloud of dark smoke was so huge that it was reportedly very visible from Penang Island.
Sources: Free Malaysia Today, YouTube Macam Macam Channel.