Commuting by subway? What you need to know about air quality

My summary would wander away from the subject.
CNN
Commuting by subway? What you need to know about air quality (article)
Summary
I reconfirmed by reading this article that I was really lucky because I can go to my office on foot. My thoughts were only to make time for it.
In Japan, many people commute to work by train. They probably use over two hours per day, and they won't know that train and subway air have high levels of air pollution. 
In fact, I recently think that people have bad common manners, especially in the train. They eat bread, drink a drink take out of Starbucks Coffee or canned beer. Some girls put on makeup, mothers feed a child snacks and, some people call a person on their phone though it's not allowed.
So we just need to know about air quality that is really bad and it affects our health. 
I think that it is difficult to be improved because people and companies don't know it. They think that cars only have high levels of air pollution, and it needs a lot of money to fix station's environment.
Each of us has to take care of our health.
Don't eat something in the train, even if nobody forbids you. It is better to wish your hands and to rinse your throat after you come back home.

Words in this story

forbid / refuse to allow (something).  prohibit, ban, outlaw, make illegal

ventilation /noun/ the provision of fresh air to a room, building, public discussion or examination of an opinion, issue, complaint, exhaust.

solution /səlúːʃən/  pollution /pəlúːʃən/  

tunnel /tˈʌnl/  comparison /kəmpˈærəsn/