PM2.5は、大気中に浮遊している直径2.5μm（1μm（マイクロメートル）＝1mmの1000分の1）以下の非常に小さな粒子です。PMとは「Particulate Matter（粒子状物質）」の頭文字をとったもので、工場や自動車、船舶、航空機などから排出されたばい煙や粉じん、硫黄酸化物（SOx）などの大気汚染の原因となる粒子状の物質のことです。
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