Recently, a ‘smoking’ phenomenon observed during snowfall in Beijing has sparked widespread discussion online. In reality, this ‘smoke’ isn’t smoke at all, but a natural occurrence known as ‘steam fog’ (or ‘ice fog’). It happens when extremely cold air—typically below -10°C—meets relatively warmer ground or unfrozen water surfaces such as lakes, rivers, or freshly fallen snow. Moisture from the surface rapidly evaporates and instantly condenses into tiny ice crystals upon contact with the frigid air, creating a wispy, white mist that appears to rise like smoke from the ground. This low-lying fog is especially visible in the early morning or during sudden temperature drops. Beijing’s cold, dry winters, combined with strong Arctic air masses moving southward, create ideal conditions for this spectacle when snow is present but not fully frozen. Experts note that the phenomenon is harmless—it results from the interplay of low temperatures and humidity—and may also reflect the urban heat island effect, as city centers retain slightly more heat than surrounding areas, causing snow to sublimate more readily. Though fleeting, this ethereal sight adds a unique visual charm to Beijing’s winter landscape.
近日，北京下雪时出现‘冒烟’现象，引发网友热议。实际上，这种‘冒烟’并非真正的烟雾，而是一种被称为‘蒸汽雾’（或‘冰雾’）的自然现象。当极冷的空气（通常低于-10℃）遇到相对温暖的地面或水体（如未结冰的湖面、河流或刚落下的雪），地表水分迅速蒸发，随即在冷空气中凝结成微小冰晶，形成类似白烟的雾气。这种雾贴近地面飘散，视觉上宛如大地‘冒烟’，尤其在清晨或气温骤降时更为明显。北京冬季寒冷干燥，一旦遭遇强冷空气南下，若恰逢降雪或地面积雪未融，就容易出现这一奇观。专家指出，该现象无害，是低温与湿度共同作用的结果，也从侧面反映出城市热岛效应——市区温度略高于郊区，使积雪更易蒸发。这一景象虽短暂却极具美感，成为冬日北京一道独特的风景线。
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