Matched context for pollute and warm up

The page lists matched contexts for pollute and warm up.

Share - pollute	Share - warm up	Phrase
8.30%	16.61%	engine [does] {pollute or warm up}
2.87%	2.33%	not {pollute or warm up}
7.37%	0.52%	{pollute or warm up} air [perform operation]