As Moosa and Sajid flee from the city, the chemical containers in the factory build up and get closer and closer to releasing the fatal gasses. Unaware of the silent ticking chemical time bomb, Tiwari's colleagues Milind and Zoya check the chemical factory on a haunch. There, seeing the dead supervisor, they realize that something is amiss and soon get into a gunfight with men Moosa has left behind to watch over the factory. Outgunned and injured, Milind tries to contact Tiwari for backup but is unable to reach him.Moosa finally sees his mother on the news and realizes that she is in Delhi. He attempts to go back to the factory to disable his deadly scheme, explaining to Sajid that he will attempt the attack again in a few days, once his mother is safe. Sajid, however, attempts to stop Moosa from returning to the chemical factory and a brutal fight to the death occurs in which Moosa is repeatedly stabbed through the neck by his accomplice.
In the closing scenes of season 1, we see Tiwari looking vaguely satisfied after seeing Moosa's corpse, unaware of the impending gas explosion in the chemical factory. We briefly see an industrial gasket explode from pressure before the credits roll in, leaving us wondering whether the sinister plot that season 1 has been building toward actually comes to pass or not.So let's see if we can figure out whether Moosa's plan worked. Despite the plan's perpetrator being dead, the technically savvy terrorist has set in motion events that cannot be easily stopped. Going so far as sacrificing his men by ordering them to (unknowingly) stay back at the factory until it exploded, Moosa even took into consideration the possibility that his clandestine plan would get discovered by the authorities, and we see happen when Zoya and Milind decide to investigate. The very same men left behind by Moosa manage to outgun the two TASC agents, delaying their call for backup, which could have resulted in the factory's critical condition being noted.
This, in fact, is the most dangerous aspect of Moosa's plan that hints at its success — no one (except Sajid), not even his own men, know that the factory is about to explode. Even the agents trapped in there, who know that something sinister is going on at the factory, don't truly know the magnitude of the situation they have walked into. And completely oblivious, which is a new look for him, is Agent Tiwari who, after seeing Moosa's corpse, possibly thinks that the threat of an imminent terrorist attack is over.Earlier, whilst driving away from the factory, Moosa mentions in passing that within 2 hours, all of Delhi will be covered by poisonous gas. If we take this as the time limit for his attack to reach its peak of destruction and consider that Moosa's subsequent fight with Sajid lasts about an hour, this gives the TASC team roughly 1 more hour to possibly limit the destruction caused by the factory.
Most likely, this is what happens. We have seen violent terrorist attacks, like the scooter bomb at Kala Ghoda, occur on the show. Hence, it is possible that Moosa's plan also succeeds, up to an extent, and kills the people closest to the factory. The all-out destruction of Delhi, as envisioned by Moosa, is unlikely because it would change the course of the show into one of war between 2 countries. On multiple occasions, it is pointedly stated that a large-scale terrorist attack on India will result in military action.Lastly, as a final confirmation that Moosa's plan doesn't end up destroying the capital city and plunging the nation into war is the season 2 trailer, which shows a relatively "calm" Tiwari working at a desk and missing the action of the field. His partner, JK, is handling a hostage situation in Chennai. This would not be the case if the factory had exploded with its intended intensity that endangered millions. Hence Moosa's plan, for the most part, is unsuccessful.