我国大气污染严重， 污染废气排放总量处于较高水平。
Air pollution is quite serious in China today due to high total pollution exhaust emission level.
而从天然气消费区来看，兰州和西宁两市大气污染严重，均为煤烟型污染。
In light of the natural gas production regions, there is severe air pollution in Lanzhou and Xining, especially the smoke pollution emitted from coal burning.
煤矸石山易自燃，对大气污染严重，破坏周边生态环境，而且侵占大量的土地。
Vegetation restoration is one of available approach for coal gangue pile fathering, the special soil condition of coal gangue pile such as high temperature, acidification, salinity etc.
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