El Nino Watch
Hot spots detected by satellites in the last 24 hours, mostly vegetation fires and burning. Many fires in Sumatra, Borneo or mainland Southeast Asia can mean haze.
Hazards
NASA FIRMS lists places where satellite sensors (VIIRS and MODIS) saw something much hotter than its surroundings during an overpass. Most are fires: forest and peat fires, crop burning.
Limits: a satellite only sees a place a few times a day; clouds and smoke hide fires; small fires can be missed; some hot spots are industrial sites. One dot is not one fire.
Clusters of dots matter more than single ones. Fires far away only affect Samui if the winds carry the smoke towards the Gulf of Thailand.
In El Nino years, peat and forest fires in Indonesia and Malaysia can send haze across the region (2015, 2019). Crop burning on the mainland peaks in the dry season.