The Asean Agreement on Transboundary Haze Pollution, which was signed in 2002, went into effect the following year, and Indonesia is the last country to ratify it.
The law will take effect after President Susilo Bambang Yudhoyono signs it. However, according to the law, if he does not sign it within a month, it will automatically take effect.
Last year, Indonesia was urged to sign the pact by other Asean countries after haze on Sumatra Island's Riau province blanketed Malaysia and Singapore.
At that time, the haze problem sparked a diplomatic war of words between Jakarta and the two neighboring countries.
Last year's smog crisis, blamed on forest fires started by farmers and plantation owners using slash-and-burn ground clearing in Indonesia, was worse than the 1997 Southeast Asian smog haze crisis, which caused billions of dollars in damage and lost productivity in Thailand, Malaysia, Singapore and thePhilippines, as well as in Indonesia.
Indonesian law bans the use of fire to clear land for any agriculture activities, and the prohibition applies to both corporations and individual landowners.
The Association of Southeast Asian Nations consists of Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Vietnam.