一名徒步旅行者在俄罗斯的堪察加半岛的火山烟雾里攀登。
A hiker climbs amid volcanic fumes in Russia's Kamchatka peninsula.
火山烟雾迫使许多航班取消，阻碍了北欧之间的航空运输，成千旅客被耽误。
The volcanic ash has forced the cancellation of many flights and disrupted air traffic across northern Europe, stranding thousands of passengers.
天然的浮质是由海盐、沙漠灰尘、火山爆发物与森林火情的烟雾产生的；
Natural aerosols are produced by sea salt, desert dust, volcanic eruptions and smoke from forest fires.
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