i recently took a test at my university on emisions. i believe a question may be wrong due to the vocabulary used in the sentence but my teacher says it is right here is the true/false question how it is wrote on the test. "NOX can be removed from the exhaust system using a reduction catalytic converter" my reasoning was correct in saying that it is wrong cause you cannot get rid of all the NOX from exhaust only some. my teacher says that that is what the question says. i believe the way that question is worded it means all of the NOX is removed not just some of it. Am i right that the statment is meaning all of the NOX is removed not just some?