Matched context for pollutant and impurity

The page lists matched contexts for pollutant and impurity.

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