There really isn't a way around that. There are vastly more poor people than rich people, and the difference between emissions of cars typically owned by rich p

There really isn't a way around that. There are vastly more poor people than rich people, and the difference between emissions of cars typically owned by rich people and poor people is marginal if anything. If you want to make an impact on emissions and congestion, you are going to have to change the behavior of large numbers of people. If you want to ameliorate the effects of this on poor people, you can invest the money into decent public transit options.