To control PM2.5 from solid waste combustion, combustion simulation, thermogravimetric analysis, and scanning electron microscopy were performed. Remarkable PM2.5 formation is an explosive release accompanied by acute weight loss and heat release over an interval of 300-400 degrees C. Sawdust starts to emit PM2.5 from approximately 200 degrees C. Plastic shows a little lag in PM2.5 emission from approximately 350 degrees C and constantly emits PM2.5 until 600 degrees C. When the temperature was 55-130 degrees C above of the ignition temperature or 20-65 degrees C above of the maximum weight loss temperature, the highest PM2.5 concentration was detected. Among combusted single wastes, plastic emits the maximum amount of PM2.5 at 10.7 mg/g, followed by rags (6.59 mg/g), sawdust (5.70 mg/g), food waste (5.49 mg/g), and paper (2.86 mg/g). Diverse sources have varied morphologies, which would help in identifying PM2.5 from various wastes. PM2.5 emitted by plastic is a well-distributed particulate that is spherical in shape. PM2.5 emitted by rag and food waste was finer than others and tended to aggregate to form a fragment, but PM2.5 from food waste was more compactly formed. PM2.5 from paper and sawdust was not easy to distinguish. However, their piecelike or block-shaped particulate usually adhered to a specific carrier. EDS checking revealed that all PM2.5 emitted via waste combustion was rich in carbon. There were 32.6-73.7% volatiles in PM2.5. PM2.5 from plastic combustion contained only carbon, hydrogen, and oxygen, whereas in PM2.5 emitted via the combustion of other wastes, Si, Ca, and Al were very common.