See also:

Exhaust Emission Control System
The Exhaust Emission Control System is a highly effective system which controls exhaust emissions while maintaining good vehicle performace. ...

Crankcase Emission Control System
The positive crankcase ventilation system is employed to prevent air pollution caused by blow-by gases being emitted from the crankcase. This system supplies filtered fresh air to the crankcase th ...

2010 Hyundai Tucson review by By Scott Burgess
It has spent nearly two decades repairing and then polishing its reputation. In the past, critics, including myself, have accused it of copying designs and then dulling them up. Some vehicles had ...