Kiro 7 in Seattle reported on this, info from them below.
My opinion on this is simple, obviously there wasn't research done for these numbers. What vehicle are they comparing it to. Even a partial zero emission vehicle, surely is more harmful than what can be expelled from the human body. They are also basing this on the premise that you are breathing heavy while commuting to wherever you are going to. I can see a racer breathing extra heavily during a race, but thats once a weekend in race season, hardly justification for a tax. Based upon this, a runner obviously should also have a higher tax, as well as a track athlete, or americanized football player. So problem solved America should just become or remain what it is viewed as outside of the states, a country of unhealthy people (at this point in my life I fall into this category too, but am at least doing things to better my fitness). Simple this isn't a democrat vs. republican type of debate, because this was a rep agreeing with a dem proposal. This is an issue of being so lost and out of touch with the world, if our government is this "damn dumb" then surely we will not survive.