Are city tolls fair?

In the draft law on mobility (France), there is the possibility for cities to introduce city tolls, as it already exists in London, in order to reduce traffic and, at the same time, the pollution. The Green politician Yannick Jadot, however, is against it. Such a system would be a social discrimination, among other things because there would be no parking spaces or free parking spaces outside the cities. The Crit'Air system already exists is suitable for improving air quality. As an additional social measure, he advocates besides to double the exchange premium.