Matched context for impurity and pollutant

The page lists matched contexts for impurity and pollutant.

Share - impurity	Share - pollutant	Phrase
16.54%	3.91%	remove {impurity or pollutant} [perform operation]
3.66%	1.15%	oxidize {impurity or pollutant} [perform operation]
4.42%	0.83%	{impurity or pollutant} concentration
5.76%	0.58%	contain {impurity or pollutant} [perform operation]
3.81%	0.98%	gaseous [state] {impurity or pollutant}
3.94%	0.58%	{impurity or pollutant} removal