What is the term for gases that are released into the air by cars, contributing to air pollution

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Dementia is most commonly associated with what?

9. withdrawal occurs when alcohol is removed from the system after the brain a. adapted to the continued presence of alcohol b. become physically saturated with alcohol c. become impervious to the effects of alcohol d. begun to treat alcohol as a poison