Matched context for purification and after-treatment

The page lists matched contexts for purification and after-treatment.

Share - purification	Share - after-treatment	Phrase
10.39%	48.20%	{purification or after-treatment} device
4.48%	19.63%	exhaust [physical/chemical] {purification or after-treatment}
5.69%	11.60%	gas {purification or after-treatment}