在山西大同市的云冈石窟，建造于北魏朝代，是世界上最珍贵的文化遗址之一。

The Yungang Caves in Datong, Shanxi Province, which were built during the Northern Wei Dynasty, is one of the most valuable cultural relics in the world.

云冈石窟地区云冈组上段砂岩中碳酸盐胶结物的含量普遍在10%以上，其主要矿物成分为含铁方解石和含铁白云石。

Carbonate cement is universally more than 10% in sandstones of the upper Yungang formation in Yungang Grottoes area. It's mainly composed of ferriferous calcite and ferriferous dolomite.

为了解云冈石窟大气中粉尘污染的现状，用X射线衍射、扫描电镜(EDAX)和显微镜对大气中粉尘的主要物质成分进行了分析。

To know the current status of airborne pollution in Yungang Grottoes, main substantial composition of the deposition of airborne particles is analyzed by means of XRD, SEM (EDAX), and microscope.