| environ. |
fume Solids in the air that have been generated by the condensation of vapors, chemical reactions or sublimation (a direct change from solid to gas). Often metallic oxides or metals, these particles are less than 1 micrometer in diameter and may be toxic (由蒸汽凝结，化学反应或升华(由固体直接变为气体)在空气中产生的固体。通常是金属氧化物或金属，颗粒的直径小于1微米，而且可能有毒。); smoke An aerosol, consisting of visible particles and gases, produced by the incomplete burning of carbon-based materials, such as wood and fossil fuels (一种气溶胶，由可见颗粒和碳基础材料的不完全燃烧产生的气体组成，碳基础材料如木材和矿物燃料。) |
