It can decrease the gross of contamination such as soot and sulfur dioxide that emit into atmosphere through changing the using mode and ameliorate the form using energy.

改变传统生物质资源的利用方式，改善现有的能源利用结构可以减少烟尘、二氧化硫等主要污染物的排放总量，促进环境质量的改善。

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"In addition to the cases of gross contamination there have been cases of trace contamination, " Ms Brown added.

BBC: Horsemeat scandal: Public quizzed on contamination

The results of FSAI tests, released to the UK FSA on 14 January, revealed some burgers made at the Silvercrest plant contained up to 29% horsemeat, constituting a "gross contamination".

BBC: UK

The FSA was using the 1% threshold "as a pragmatic level to determine the difference between gross and trace contamination", she said.

BBC: Horsemeat scandal: Public quizzed on contamination