They also tend to produce poor-quality coal which generates relatively high levels of pollution when burned.
他们也倾向于生产劣质煤，这些煤在燃烧时产生相对高的污染水平。
The coal it produces is mostly poor in quality and rich in ash; it should be washed before shipping to make it more efficient, but is not.
它所产的煤炭大部分质量差而灰尘多；要想提高这些煤炭的效率，在装运之前应该要清洗但它们并没有被清洗过。
And Indian coal is generally of poor quality, which makes it unsuited to newer, more efficient, coal-fired power stations.
而印度的煤炭质量差，不能适用于更高效的新型煤炭发电厂。
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