Seeding isn't as straight forward for Singapore as the haze comes from fires in Indonesia. Because the GP is over 3 days, it wouldn't be efficient to just cloud seed over Singapore as a change in winds could blow the haze over again quickly and they would have to keep seeding. The most efficient way at the moment would be to seed cloud across Sumatra, but I doubt the Indonesians would want to have foreign planes seeding on their behalf for political reasons.

Finally, the readings, which you can find National Environment Agency micro site, shows that the readings are gradually returning back to normal territory.

Hope you have a good time in Singapore and the haze stays away!