Transboundary haze pollution originating from fires in Southern Southeast Asia affects about half of the countries in Southeast Asia with varied intensities on an almost annual basis. Haze not only affects visibility but also causes widespread health problems, transportation disruptions, and other socioeconomic issues. This haze and the fires that cause it have been a key topic for environmental politics research in the region since the late 1990s. This has largely been driven by one overarching objective: how to prevent haze from returning in the following years. However, conditions on the ground (mostly in Indonesia and in the larger Southeast Asian region) have been changing and evolving drastically, which has resulted in a dynamic research agenda that has to keep up. Within the context of environmental politics, fires and haze can be viewed through the broad lens of national interest. There is a strong link between the severity of haze and the burgeoning agribusiness sector in the region: that of oil palm in particular. Oil palm is a very important crop in the region, with Indonesia and Malaysia generating almost 90% of total global palm oil output. Hence, national and business interest theories have often been used as a framework for research in this area, with commercial oil palm plantations often being the unit of analysis. However, this has been called to question lately as these plantations face increasing market pressure to act more sustainably. A new group of actors that have since been highlighted are smallholders, either independent or in contract with larger plantations. There is potentially much to be uncovered with regard to the relationships between smallholders and commercial plantations and how they affect patterns of fire use and global sustainability issues. Related to this is the ever-evolving collection of local, regional, and national policies (and related enforcement issues) on land and fire use in Indonesia. One key area of contention is the use of peatlands. Fires on peat produce the thick, sooty smoke that travels across national boundaries, and they are notoriously hard to put out. Political research in this area is heavily framed by a tough debate between the scientific community and socioeconomic concerns. While peatlands play an important role in the global climate change balance, they also face immense pressure for development fueled by the scarcity of land. The regional context has also been an important theme for haze research. Haze primarily affects the Southern Southeast Asian subregion, and the major players of the palm oil sector come from this area. The Indonesian palm oil sector is a vibrant combination of Malaysian, Singaporean, and local companies. And the Association of Southeast Asian Nations has been the hub of cooperation and mitigation activities over haze. Hence, many scholars have searched for answers at the regional level. However, new national developments, such as Singapore’s Transboundary Haze Pollution Act, suggest that countries may be losing confidence in regional efforts.