Comprehensive and systematic analysis has been made about the dust pollution of the arid and semi arid areas in Gansu province based on statistic data of TSP and naturaldust within last 10 years.
本文用近10年来TSP、降尘监测数据对甘肃省干旱、半干旱地区尘类污染进行了较系统、全面地分析。
2
Natural aerosols are produced by sea salt, desert dust, volcanic eruptions and smoke from forest fires.
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；
3
Dust storms are a natural phenomenon, but are influenced by human activities and are now just as serious as traffic and industrial air pollution.